Which is the source in variations in a population of organisms? A. Changes in environment.
B. Changes in genes.
C. The interaction of genes with an environment.
D. The interaction of individuals with an environment.

Which of these is a major trend in land plant evolution? a) the trend toward smaller size b) the trend toward a gametophyte-dominated life cycle c) the trend toward a sporophyte-dominated life cycle d) the trend toward larger gametophytes

How do the evolutionary chart and the video support the claim that all living things are made up of cells?

Which of th following is needed for cellular respiration to occur