N 1. In early embryonic development, the cells start to differentiate based on
O a chemicals secreted by the blastocyst.
b. hormones secreted by the uterus.
c. their location.
d. amniotic fluid produced by the placenta.
e. their layer.

Which of the following is not a defining characteristic of plants?

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.

Which statement describes the punctuated equilibrium theory?