absorb -- take in
adaptations -- traits that help an organism survive in its environment
camouflage -- an adaptation that allows animals to blend in with their environment
defense -- protection
endangered -- when a species' numbers become so low that it could become extinct
environmental changes -- changes to living or nonliving things in an ecosystem
extinct -- the disappearance of a species when the last one of its kind dies
fossil -- any evidence of a living thing from the past
hibernation -- when an animal's body activities slow down and it lives off its body fat
indicator species -- certain species that are more sensitive to pollution than others
locomotion -- movement from place to place
migrate -- to change location on a regular basis
mimicy -- when one kind of living thing looks like another kind
natural disaster -- a natural event that causes destruction in an environment
pollution -- adding harmful things to the air, water, or land stimulus -- something in an environment that causes a living thing to respond
tropism -- the response of a plant to something in its environment
