Which example is most clearly a case of density-dependent population regulation?

A) the summer drying of savanna grass for an insect that feeds on grass sap
B) a dangerous new flu strain that is transmitted among humans by sneezing
C) the first hard frost of fall for a population of annual morning glory vines
D) the occurrence of rainstorms for an opportunistic desert annual


Answer: B

Biology & Microbiology

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. Using the logistic growth curve shown in the graph and what you know about population growth, what is represented by the dashed line?


a. biotic potential
b. exponential growth
c. carrying capacity
d. extinction of the population

Biology & Microbiology

Respond to statements 151–155 in reference to the five animal

phyla listed below. a. Annelida b. Arthropoda c. Mollusca d. Echinodermata e. Rotifera D 151. Trilobites were members of this phylum. M 152. The larval stage in this phylum has bilateral symmetry, whereas the adult stage exhibits radial symmetry. M 153. Although most members are enclosed by hardened shells, this phylum name literally means “soft body.” E 154. This phylum has the greatest number of species. D 155. “Wheel animals” are in this phylum.

Biology & Microbiology

An enzyme is about the same as a(n) 

A. catalyst. B. inhibitor. C. substrate. D. end product.

Biology & Microbiology

When the O2 in the muscles of an individual who has exercised for a long period of time is used up, this condition is known as ________

Fill in the blank(s) with correct word

Biology & Microbiology