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Chapter 1 Lesson 1

organism A living thing.
cell Small building blocks that make up organisms.
unicellular Single-celled organisms like bacteria.
multicellular Organism that are composed of many cells.
metabolism. The combination of chemical reactions through which an organism builds up or breaks down materials.
stimulus Your reactions to things
response An action or change in behavior.
development The process of change that occurs during an organism’s life, producing a more complex organism.
asexual reproduction Involves only one parent to produce offspring that are in identical to the parents.
sexual reproduction Involves two parents and combine their genetic material to produce a new organism that differs from both parents.
spontaneous generation The mistaken idea that living things can arise from nonliving sources.
Controlled experiment A scientist carries out a series of tests that are identical in every respect except for one factor.
autotrophs Organisms that make their own food.
heterotrophs Organisms that can't make their own food.
homeostasis The maintenance of stable internal conditions.
Created by: 0003651stu