Which scenario is the best example of competition between individuals of the same species? (1 point)
• Savannah predators compete to consume antelope.
• Fish compete for shelter in a coral reef.
• Trees in a forest compete for sunlight.
• Hermit crabs compete for shells to live in.
Hermit crabs compete for shells to live in.
Jocelyn and her children went into a movie theater and she bought $75.50 worth of candies and pretzels. Each candy costs $4.75 and each pretzel costs $3.50. She bought a total of 18 candies and pretzels altogether. Determine the number of candies and the number of pretzels that Jocelyn bought.
Let's assume the number of candies Jocelyn bought is "x" and the number of pretzels she bought is "y."
We can create two equations based on the given information:
1. The total cost of candies: 4.75x
2. The total cost of pretzels: 3.50y
The total cost of candies and pretzels combined is $75.50, so we have the following equation:
4.75x + 3.50y = 75.50
Jocelyn bought a total of 18 candies and pretzels, so we have another equation:
x + y = 18
We can now use these two equations to solve for x and y.
Rearrange the second equation to solve for x:
x = 18 - y
Substitute this expression for x into the first equation:
4.75(18 - y) + 3.50y = 75.50
Simplify the equation:
85.50 - 4.75y + 3.50y = 75.50
Combine like terms:
-1.25y = -10
Divide both sides by -1.25:
y = 8
Substitute the value of y back into the second equation to solve for x:
x + 8 = 18
x = 10
Therefore, Jocelyn bought 10 candies and 8 pretzels.
To determine which scenario is the best example of competition between individuals of the same species, let's break down the options and see how they fit the concept of intraspecific competition:
1. Savannah predators compete to consume antelope: This scenario involves competition, but it is between predators and prey rather than individuals of the same species.
2. Fish compete for shelter in a coral reef: This scenario involves competition among individuals of the same species (fish) for a limited resource (shelter in a coral reef). This is a good example of intraspecific competition.
3. Trees in a forest compete for sunlight: This scenario involves competition, but it is between different species of trees rather than individuals of the same species.
4. Hermit crabs compete for shells to live in: This scenario involves competition among individuals of the same species (hermit crabs) for a limited resource (shells). This is also a good example of intraspecific competition.
Based on the analysis, the scenarios that best exemplify competition between individuals of the same species are "Fish compete for shelter in a coral reef" and "Hermit crabs compete for shells to live in." Both of these examples illustrate the concept of intraspecific competition where members of the same species compete for resources necessary for survival.