Pneumocystis is an organism normally found in the human lungs that can cause pneumonia. it seldom causes problems in individuals with healthy immune systems. however, people with aids sometimes become seriously ill with pneumonia. this is most likely due to the fact that individuals with aids have

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.