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?
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It reduces the need to find a mate.
It increases the energy needed to reproduce.
It increases the genetic diversity of the tree's offspring.
It decreases the time needed to reproduce.
It increases the genetic diversity of the tree's offspring.
_______ provide evidence that living things evolved from earlier species.
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Historical fictions
Religions
Fossils
Videos of dinosaurs
Fossils.
Which of the following is an example of natural selection?
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Pesticides are sprayed in a field, resulting in an increase in crop growth and a decrease in insect population.
Cricket frogs prefer to sleep during the day, while red-eyed tree frogs prefer to sleep during the night.
To produce a more desirable fruit, a farmer crosses a tree that produces sweet oranges with a tree that produces large oranges.
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 survive an unusually cold winter, while many normal rabbits do not survive.
Evolution is a
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theory because it is an explanation that is supported by extensive observations, experimentation, and reasoning.
prediction because it makes an educated guess about events that will occur in the future
variable because it is a factor that can be changed during experimentation.
law because it has been proven without exception under certain stated conditions.
Theory because it is an explanation that is supported by extensive observations, experimentation, and reasoning.
Diagram 1 shows the fossilized remains of the lower portion of a camel's leg. Each subsequent diagram shows the same portion of a camel's leg, but the diagrams are from progressively later time periods. Diagram 4 shows the most recent fossil. These diagrams demonstrate
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how fossil evidence cannot be used to support evolution.
that all living organisms have increased in size over time.
how fossil evidence can be used to show the evolution of a species over time.
that modern camels have more toes than earlier species of camels.
How fossil evidence can be used to show the evolution of a species over time.
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
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genetic engineering.
selective breeding.
environmental factors.
human impact.
Environmental factors.
Cheetahs are one example of a population that has very limited genetic variation.Which of the following groups of animals are most likely to have a limited variety in the genetics of their population?
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animals that live on more than one continent
animals that have a very large population
animals that live in both hot and cold climates
animals on the endangered species list
Animals on the endangered species list.
What genetic factor is most likely to result in the extinction of an entire species?
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a lack of genetic variety in the population
a genetic defect in a few members of the population
a genetic resistance against many diseases
a lot of genetic variety in a population
A lack of genetic variety in the population.
Coyotes primarily feed on small mammals, such as rabbits, squirrels, birds, and mice. Many of these prey try to escape from coyotes by burrowing into the ground. Which of the following characteristics is most likely to be naturally selected to increase a coyote population's chances for survival over time?
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sharper claws that aid in digging
blunt teeth that can be used for grinding
lighter colored fur that reflects light
smaller ears that are less sensitive to noise
Sharper claws that aid in digging.
Over time, the climate of a region becomes cooler. How will this most likely affect the species living in that region?
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Some species that already have or that develop cold-weather adaptations through natural selection will survive, while species without cold-weather adaptations may go extinct.
All of the current species living in the region will migrate to warmer areas, while species adapted to cold-weather climates will migrate into the region.
All of the current species living in the area will become extinct, and new species better adapted to the climate will form and populate the region.
Most of the current species living in the area will develop beneficial mutations, which will lead to adaptations that help them survive in the new climate.
Some species that already have or that develop cold-weather adaptations through natural selection will survive, while species without cold-weather adaptations may go extinct.
Small differences between parents and offspring accumulate over time. This process
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prevents parents from being able to care for their offspring.
makes it impossible for species to adapt to changes in their environment.
results in only one type of organism that has the exact same characteristics as its ancestors.
results in many different types of organisms with different characteristics from their ancestors.
Results in many different types of organisms with different characteristics from their ancestors.
Many sponges can reproduce asexually. Ladybugs, on the other hand, reproduce sexually. When small bits of a sponge are broken off—often by currents or by predators—they can float to new regions and regenerate as new sponges. A ladybug must find a mate before it can reproduce.One disadvantage of the sponge's method of reproduction is that
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it requires more energy.
its offspring have little genetic diversity.
its offspring have greater genetic diversity.
it must devote a greater portion of its life cycle to reproduction.
Its offspring have little genetic diversity.
A potato plant can reproduce asexually so that one potato can often give rise to many other potatoes. Strawberry plants can reproduce sexually.A potato plant puts a large amount of its energy into growing a tuber, which is the part that humans eat. The tuber can grow large and provide energy for the plant during the winter, or it can be used to grow new potato plants. A strawberry plant, on the other hand, puts much of its energy into growing flowers to attract insects that aid in pollination. After fertilization, the strawberry plant must then also grow seeds as well as fruit to attract animals that disperse the seeds.Based on this information, the asexually reproducing potato plant most likely devotes _______ to reproduction than the sexually reproducing strawberry plant.
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more energy
fewer spores
less energy
more seeds
More energy.
If there were no decomposers, which of the following would most likely happen?
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Some plants might die due to a shortage of important nutrients.
The amount of dead plant and animal matter would decrease.
Plants and animals would remain living for a longer period of time.
Animals would start carrying out photosynthesis.