Living on land required that plants
a. evolve photosynthetic pigments
b. conserve water
c. exchange gases
d. have cell walls

for some reason this simple question keeps messing with me. !

What is the genotype of the male circled in pink? ο χου lo xay xaya done answer was xay

Which of the following is caused by reproductive isolation within a species? a. a decrease in gene flow b. an increase in genetic flow c. a decrease in genetic drift d. an increase in gene flow

An uncomfortable feeling in the ears when descending in an airplane is caused by changes in air pressure on the: a. inner ear b. middle ear c. eardrum d. hammer/anvil