________ is the study of the evolutionary relationships among a group of organisms.

A. Systematics
B. Clastistics
C. Statistics
D. Logistics


Answer: A

Biology & Microbiology

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When threshold potential is reached, ____

a. the activation gates of Na+ channels open b. the inactivation gates of Na+ channels open c. the activation gates of K+ channels open d. the inactivation gates of Na+ channels open e. Na+/K+ active transport pumps are activated

Biology & Microbiology

Explain how proprioceptors work

What will be an ideal response?

Biology & Microbiology

The transfer of heat from the plant to the surrounding environment is influenced by the existence of the ________ layer

Fill in the blank(s) with correct word

Biology & Microbiology

Your text describes an experiment in which low-nutrient conditions select bacteria that would kill off other bacteria

When nutrients became plentiful again, these killer bacteria became less common because they had lower fitness in this environment, but they didn't become extinct. Why would some of the killer bacteria survive in the new environment? A) They're waiting for a future time when that trait may be useful again. B) They have changed the killer gene to a less costly one but can regenerate the killer gene when necessary. C) Competition must be low enough that the disadvantage of having the killer trait isn't great enough to cause extinction. D) The killer trait is a dominant trait, so it cannot be eliminated.

Biology & Microbiology