Plants cannot use this component of the atmosphere directly; it must be modified by bacteria first.

oxygen

carbon dioxide

nitrogen

water vapor

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming

What evidence did mendel find that supported his law of independent assortment? a. some traits are controlled by several different genes. b. a trait can be passed on from a parent to an offspring. c. most traits have a dominant form and a recessive form. d. different traits are passed on independently of each other.

To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a