Which of the following decreases the population size? a. favorable light and temperatures
b. adequate food supply
c. unable to compete
d. able to migrate, hide, or defend
e. able to resist disease

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods.c. it shows that these organisms share the same habitat.d. it provides evidence that these organisms suffered a genetic mutation.