When considering nomenclature for scientific names, what is the difference between the two primates, Homo sapiens and Homo erectus?
A. One is a primate but the other is not.
B. They are animals of a different kingdom.
C. They are animals of a different order.
D. They are animals of a different species.
E. They are animals of a different genus.
D. They are animals of a different species.
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In African finch populations, selection pressures favor birds with bills that are ________
a. either large or small, in an example of disruptive selection b. small, in an example of directional selection c. large, in an example of directional selection d. large, in an example of sexual selection
@The role of interferons is to protect the cells against viral infections.
a. Neutralization b. Opsonization c. Complement activation d. Primary immune response
Why do we seldom see more than three consumer levels in natural systems?
1.There is not enough energy to support additional levels. 2.Animals haven’t evolved to feed on animals at the third level. 3.Humans take over the role of the fourth-level consumer. 4.There isn’t enough habitat for a fourth level.
Which of the following is(are) characteristic of
acute inflammation? a. warmth b. swelling c. redness d. pain e. all of these