Decomposing organic material that releases nutrients into the soil is known as ____

a. clay
b. humus
c. silt
d. hyphae


e. fungus


ANSWER: b

Biology & Microbiology

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The fossil Lucy (Australopithecus afarensis) is significant because, at _____ years old, hers is the first species to _____

A. 20 million; have been fully bipedal B. 1.3 million; have hominin brow ridges C. 3.2 million years; be fully bipedal D. 1.3 million; migrate out of Africa E. 600,000; have homin brow ridges

Biology & Microbiology

Sickle-cell anemia is a human disease that occurs as a result of what type of mutation in the b-globin gene?

A. silent B. missense C. nonsense D. frameshift E. sense

Biology & Microbiology

Which of the following correctly describes the fate of the embryonic germ layers?

A. The endoderm forms the gut, the ectoderm forms the epidermis and parts of the nervous system, and the mesoderm forms muscles and most internal organs. B. The endoderm forms the gut, the ectoderm forms the reproductive tract and endocrine system, and the mesoderm forms muscles and most internal organs. C. The endoderm forms the inner part of all internal organs, the mesoderm forms the middle parts, and the ectoderm forms the outer coverings. D. The layers are sequential structures that all disappear during development, with the endoderm appearing first and then is replaced by the mesoderm, which in turn is supplanted by the ectoderm. E. The endoderm is an embryonic structure that disappears early, whereas the ectoderm persists as the skin and the mesoderm as the internal organs.

Biology & Microbiology

The amount of blood the heart pumps into the aorta each minute is known as ________ output

Fill in the blank(s) with correct word

Biology & Microbiology