Each tier of the biomass pyramid depicts the

____ of all the organisms in an ecosystem.
a. size
b. number of species
c. dry weight
d. total weight
e. total utilization of materials


C

Biology & Microbiology

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Compare control of breathing in a human before and during physical exercise

What will be an ideal response?

Biology & Microbiology

Archaeal cell walls ________.

A. lack murein and D-amino acids B. are disrupted by treatment with lysozyme or penicillin C. include orthomureine D. are similar to those of Gram-negative bacteria

Biology & Microbiology

Which group of fishes evolved first?

A) Ray-finned fishes B) Lobe-finned fishes C) Cartilaginous fishes D) Jawless fishes

Biology & Microbiology

If a lung is punctured in a car accident, that lobe fails to inflate even though there is no obstruction of the air passageway to that lobe. Why?

Select one: a. The trauma must have damaged the nerve path controlling ribs on that side of the lung. b. Negative feedback prevents the ribs and diaphragm on that side from causing pain. c. When the chest volume expands, air can now rush in through the puncture without filling the alveoli. d. Mucus or blood must be filling the lobe. e. Stimulation of stretch receptors in the alveolar walls initiate inhibitory nerve impulses.

Biology & Microbiology