Answer: a. natural selection can only act on existing variation
Explanation:
Natural selection is the process of differential survival and reproduction. It occurs when a beneficial trait it passed on from the parents to the offsprings in the population of the same species. A beneficial trait will not be passed to the offspring if the trait is non heritable. The trait will be passed on as a genetic component. For example, beak length the trait for beak length or genetic variation is already present in the population. It is selected on the basis of the natural selection and can be expressed in the new generation. The natural selection process acts on the individual but the results of the selection can be seen on the entire population.
Answer:
Carrying capacity
Explanation:
Carrying capacity means the number of organisms that a region can support without environmental degradation.
Answer:
Pangaea
Explanation:
When Laurentia and Gondawana, two minor supercontinents, collided, they created the Pangaea supercontinent.
Aerobic Respiration vs. Anaerobic Respiration. ... Aerobic respiration takes place in the presence of oxygen, produces a large amount of energy. Carbon dioxide and water are produced as the waste products. Anaerobic respiration takes place without the use of oxygen, produces small amounts of energy.
Explanation:
the communal dwelling of an American Indian village of Arizona, New Mexico, and adjacent areas consisting of contiguous flat-roofed stone or adobe houses in groups sometimes several stories high. b : an American Indian village of the southwestern U.S.