Which statement about nervous tissue is false?
a. A dendrite is specialized for transmitting signals.
b. An axon in the human body can be as much as a meter long.
c. Neurons communicate with each other via synapses.
d. A neuron is made up of an axon and a glial cell.
e. A nerve is made up of many neurons.
d
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Which of the following agents lacks a cell wall and is the smallest known free-living form?
a. Chlamydia b. Mycoplasma c. Rickettsia d. Coxiella
Which statement about autotrophs is true?
a. Photoautotrophs are the most common ecosystem energy source. b. Chemoautotrophs depend on sunlight to generate energy. c. Photoautotrophs consist primarily of bacteria and archaea. d. Chemoautotrophs are typically found in grazing food webs.
The world ocean covers ________ of Earth's surface
a. 94% b. 71% c. 46% d. 68%
Agar is produced by
a. brown algae. b. red algae. c. phycobilins. d. foraminiferans. e. brown and red algae.