How did horses change as they evolved over the past 50 million years? A. Horses used to have four distinct digits.
B. Horses used to be bigger.
C. Horses used to have no distinct digits.
D. Horses used to have very long teeth.

Tlymphocytes mature in the? a. thyroid gland. b. bone marrow. c. spleen. d. thymus.

Which of the following is most important in making the typical seed more resistant to adverse conditions than the typical spore? a) a different type of sporopollenin b) an internal reservoir of liquid water c) integument(s) d) ability to be dispersed e) waxy cuticle

Pl which diagram illustrates prophase?