An atom is best characterized as ________ .
a. a structural unit of interacting tissues
b. an organized array of cells that interact in a collective task
c. a fundamental unit of all substances, living or not
d. the smallest unit of life
e. a biological complex made up of smaller units called molecules
a. a structural unit of interacting tissues
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What important ecological role do lichens play?
What will be an ideal response?
Vocal cords are made of:
a. smooth muscle b. cartilage c. skeletal muscle d. ligaments e. tendons
Which classification includes fungi and bacteria?
a. herbivore b. carnivore c. omnivore d. decomposer e. photosynthetic organism
Nitrogen-fixing bacteria convert ____ to ____, which is a form of nitrogen that plants can use.
A. nitrogen gas; ammonia B. ammonia; nitrogen gas C. nitrogen gas; nitrates D. nitrogen gas; nitrites E. ammonia; nitrates