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Consider the following scenario:

A scientist is analyzing one bird population. There is a large amount of variation in size in the population. There are also predators that eat these birds. After collecting evidence on three types of birds (small, medium, and large), the scientist discovers that the large birds are less likely to be killed. The only major genetic difference is the size of the birds. The colors and behaviors of the large birds are the same as those of the small and medium birds.

Using reasoning skills, which is the most credible explanation for what is contributing to this higher rate of survival?

A. The large birds may be the smallest group in the population.

B. The large birds may be the hardest for predators to see.

C. The large birds may be the hardest for predators to attack.

D. The large birds may be the largest group in the population.

3 answers

B. The large birds may be the hardest for predators to see. This explanation makes sense because if the larger birds are less visible to the predators, they would have a higher chance of survival. The other options do not provide a convincing explanation for why the large birds are more likely to survive.
Anna mixes the letters S, E, L, E, C, T, E, and D thoroughly. Without looking, Mary draws one letter. Expressed as a fraction, decimal, and percentage, what is the probability that E will not be the letter Mary selects?
A. Start Fraction 3 over 8 End Fraction, 0.375, 37.5%
B. eight-fifths, 1.6, 16%
C. The fraction is 5 over 8., 0.625, 62.5%
D. Start Fraction 8 over 3 End Fraction, 2.667, 26.667%
To find the probability that E will not be the letter selected, we need to first count the total number of letters, and then count how many of them are not E.

Total number of letters: 8

Number of letters that are not E: 5 (S, L, C, T, D)

Probability of selecting a letter that is not E:

5/8

This can be expressed as a fraction, decimal, and percentage:

Fraction: 5/8

Decimal: 0.625

Percentage: 62.5%

Therefore, the answer is (C) The fraction is 5 over 8., 0.625, 62.5%.