Do the small gaps in capillaries simply allow substances to pass through or does it allow substances to pass through it easily?

Which layer will become saturated first when rain falls?

What is the identity of the planets?

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.