Which is the closest living nonvascular relative to vascular plants?
a. hornworts
b. liverworts
c. mosses
d. ferns
e. red algae
ANSWER: a
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Which factor has caused primary productivity in Amazon forests to decline steadily over the past 30 years?
a. ocean acidification b. nitrogen fixation c. soil runoff d. increasing droughts e. depletion of oxygen in the atmosphere
Where are male cones in gymnosperms?
a. in the highest branches of the tree b. evenly distributed randomly throughout the tree c. in the lower region of the tree d. immediately adjacent to each female cone
Based on the pedigrees that you have generated, does the inheritance of cystic fibrosis appear to be related to the sex of the offspring?
a. Yes b. No
Upon fertilization, the egg and sperm fuse to form a single cell called a(n) ________.
A. embryo B. gamete C. zygote D. gonad