Sketch the following organisms and label the anterior, posterior, dorsal, and ventral sides
A) Human
B) Cat
C) Clam
D) Grasshopper
E) Earthworm

Which of the following conclusions can be drawn

Aplant may open end close its stomata to prevent excess water loss and maintain

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.