What is the meaning of a null hypothosis being rejected

Which of the following are the functions of the integumentary system? yadda-yadda, the 1st answer is the brainliest. : )

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

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.