A deep sleep which an animal slows down its body
anything that causes a reaction or change in an organism
An organism's reaction to a stimulus
Response in an organism characterized by an increased heart rate, anxiety, decreased blood supply to muscles
Chemical signal produced in one part of an organism that affects cell activity in another part of the organism
humans breed specific planst or animals for desired traits
An inherited trait that improves survival and reproductive success
Change in DNA
The movement of organisms toward or away from an external stimulus
Comes from inside an organism's body
when internal processes slow down during hot, dry weather
differences that occur in individuals within a species
when plants conserve energy and stop growing
group of organisms that can reproduce only with one another and not with other organisms
set of actions taken by an organism in response to a stimulus
eyes, noses, skin, whiskers, ears
a process by which organisms that inherit helpful traits tend to reproduce more successfully
maintaining a stable balance in the body
process by which populations gradually change over time
a group of organisms of the same species that live in the same place at the same time