When a ruminant "chews his cud," it involves regurgitation from which two digestive chambers?

a. abomasum and omasum
b. abomasum and rumen
c. omasum and rumen
d. rumen and reticulum
e. reticulum and omasum


D

Biology & Microbiology

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Which of the following is an example of how natural selection is responsible for the variation seen in the human population?

A. Africans having a tall and skinny body to dissipate heat B. Inuits in Greenland having a stockier body shape to retain heat C. Africans carrying the sickle trait in areas where malaria is prevalent D. people in the northern regions having less pigmentation in order to obtain more vitamin D E. All the answer options are correct.

Biology & Microbiology

An example of an epigenetic change is

A. a microbe secreting hyaluronidase to break down host hyaluronic acid. B. a microbe that can induce changes in host DNA, resulting in suppression of defenses or weakening of individual cells. C. a gram-negative organism releasing lipopolysaccharide from its cell wall upon lysis. D. Clostridium tetani secreting the exotoxin tetanospasmin.

Biology & Microbiology

When we examine the fossil record, we find that older fossils are in strata below younger fossils.

a. true b. false

Biology & Microbiology

An ecological relationship between organisms of different species that are in direct contact can best be described as _____.

A.) symbiotic B.) parasitic C.) taxis D.) mutualistic E.) commensal

Biology & Microbiology