Which is an example of an internal stimulus?

a) a sudden change of air temperature

b) an artificial light that attracts insects

c) an increase in the amount of water available to a plant

d) a decrease in oxygen levels in the blood during exercise

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems

In a leaf, dermal tissue a) stores food b) stores carbon dioxide c) releases oxygen into the air d) transports water from the roots

How many chromosomes are in a human gamete?