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Some people have attached ear lobes and some people have free ear lobes. The differences in these traits are caused by
a) differences in environment.
b) differences in personality.
c) differences in diet.
d) differences in genes.
The differences in these traits are caused by genes.
_______ provide evidence that living things evolved from earlier species.
a) Historical fictions
b) Religions
c) Fossils
d) Videos of dinosaurs
Fossils provide evidence that living things evolved from earlier species.
Relationships between organisms may be beneficial or detrimental. Which of the following examples shows a relationship in which both organisms benefit?
a) A tick attaches itself to the skin of a dog and takes a blood meal.
b) A female black widow spider Latrodectus mactans mates with a male spider; then, she consumes him.
c) An African wasp Certolsolen arabicus pollinates a fig tree Ficus sycomorus as it eats the tree's nectar.
d) A species of hyena known as the aardwolf consumes termites for nourishment.
An African wasp Certolsolen arabicus pollinates a fig tree Ficus sycomorus as it eats the tree's nectar. In this relationship both organisms (a wasp and a fig tree) benefit as the wasp pollinates the Fig tree while getting fed.
Look at the food web shown below. Which organisms get energy from producers?
a) squid
b) zooplankton
c) sperm whales
d) phytoplankton
Zooplankton and sperm whales get energy from producers (phytoplankton).
Which of the following is an example of natural selection?
a) Pesticides are sprayed in a field, resulting in an increase in crop growth and a decrease in insect population.
b) Cricket frogs prefer to sleep during the day, while red-eyed tree frogs prefer to sleep during the night.
d) To produce a more desirable fruit, a farmer crosses a tree that produces sweet oranges with a tree that produces large oranges.
c) Rabbits with a mutation for longer, thicker fur survive an unusually cold winter, while many normal rabbits do not survive.
Rabbits with a mutation for longer, thicker fur surviving an unusually cold winter is an example of natural selection.
There are approximately 200 species of mice that live all over the world. Deer mice are a particular species of mice that prefer to live in forests, prairies, and fields. It has been observed that deer mice that live in trees tend to have longer tails because they use their tails for balance. Deer mice that live in prairies and fields tend to have shorter tails so they are less likely to be caught when running away from predators. If a forest fire occurred in an ecosystem eliminating the majority of the trees and short-tailed mice are naturally selected over long-tailed mice, the evolution of the mice can be primarily attributed to
a) genetic engineering.
b) selective breeding.
c) environmental factors.
d) human impact.
The evolution of the mice can be primarily attributed to environmental factors in this case, as the forest fire eliminates trees that the long-tailed mice live in, and short-tailed mice would be better suited for the new environment.
Which of the following is true about genes?
a) Genes are responsible for all the traits of an organism.
b) In humans, genes are passed to an offspring from two parents.
c) Genes are made up of smaller molecules known as chromosomes.
d) The genes of a particular organism can never change throughout its lifetime.
In humans, genes are passed to an offspring from two parents is true about genes.
Some redwood trees reproduce both sexually and asexually. Once a tree reaches maturity, it can reproduce with another tree through pollination and fertilization. The tree then disperses thousands of seeds so that some of them might take root. However, a tree can also reproduce asexually. If it falls down, several smaller trees can sprout from its trunk without the need of fertilization.Why is it advantageous for a redwood to reproduce sexually when it could reproduce asexually instead?
a) It reduces the need to find a mate.
b) It increases the energy needed to reproduce.
c) It increases the genetic diversity of the tree's offspring.
d) It decreases the time needed to reproduce.
Reproducing sexually increases the genetic diversity of the tree's offspring and provides an advantage to redwoods living in a changing environment. Therefore, it is advantageous for a redwood to reproduce sexually over reproducing asexually.
How many ways can six books be arranged on a shelf?
a) 21
b) 120
c) 360
d) 720
There are 720 ways to arrange six books on a shelf.
There are eight girls competing in an ice-skating competition. In how many ways can they finish in first, second, and third place?
a) 336
b) 1,680
c) 2,016
d) 40,320
There are 336 ways in which the eight girls can finish in first, second, and third place.
To calculate this:
- There are eight girls who could finish first
- Once the first place has been assigned, there are seven girls who could finish second
- Once the first two places have been assigned, there are six girls who could finish third
Therefore, the total number of ways the girls can finish is 8 x 7 x 6 = 336.
How many ways can a president and vice president be selected from a class of 12?
a) 23
b) 72
c) 132
d) 1,320
There are 132 ways a president and vice president can be selected from a class of 12.
To calculate this:
- There are 12 candidates who could be selected for the position of president
- Once the president has been selected, there are 11 candidates remaining who could be selected for the position of vice president
Therefore, the total number of ways the president and vice president can be selected is 12 x 11 = 132.
How many ways can seven students line up for a class picture?
a) 5,040
b) 210
c) 28
d) 7
There are 5,040 ways in which seven students can line up for a class picture.
To calculate this:
- There are seven students who could be selected for the first position
- Once the first position has been filled, there are six students remaining who could be selected for the second position
- This process continues until all seven positions have been filled
Therefore, the total number of ways the seven students can line up is 7 x 6 x 5 x 4 x 3 x 2 x 1 = 5,040.
Think about the problem you chose for the service project. Was it difficult to put into effect? If you couldn't actually implement the service project, then tell why or why not you think it would be difficult.
As an AI language model, I don't have personal experiences to have a service project. But generally, the difficulty level of implementing a service project depends on various factors such as the complexity of the project, available resources, financial constraints, location, and the number of people involved. For some service projects, implementing them may be relatively straightforward, while others require significant effort and resources. It can also depend on the type of service project - for example, a project that involves physical labor or construction may be more challenging to implement than one that just requires organizing a group of volunteers.
Would a service project be difficult?
The difficulty of a service project can vary greatly depending on factors such as its scope, the amount of resources and support available, and the logistics involved. Some service projects may be relatively easy to plan and implement, while others could be more complex and require more effort to organize successfully. Overall, the success of a service project often depends on the commitment and hard work of those involved, as well as their ability to collaborate and address any challenges that may arise along the way.
What does "Was it difficult to put into effect" means?
"Was it difficult to put into effect" means asking whether the service project was challenging to implement or execute. It is asking whether there were significant obstacles to overcome or if the project required a lot of planning, resources, and some time to put into practice.
Which of the following describes advertising?
a) a true story using facts that can be verified
b) an exchange of information, news, or ideas
c) a promotion that is paid for by a company
d) an underlying point of view
Advertising is a promotion that is paid for by a company.
Why is it important to analyze the message and point of view of advertising?
a) to understand which services are best to use
b) to understand the best products to purchase
c) to understand the purpose of the ad
d) to understand which ads accurately represent reality