The main natural source of phosphorus is

a. Earth's crust.
b. fertilizer.
c. guano.
d. legumes.
e. water.


A

Biology & Microbiology

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In its use in conservation efforts, lichens are classified as an example of a(n) ____

a. biological magnified species b. endangered species c. biodiverse species d. indicator species e. exotic species

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Who is a carrier of an X-linked trait?

a. homozygous dominant female b. heterozygous female c. homozygous recessive female d. homozygous male e. heterozygous male

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Sutures are classified as ____ joints

a. synovial b. immovable c. slightly movable d. freely movable e. cartilaginous

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When does the human embryo implant in the wall of the uterus?

A) within a few hours of fertilization
B) about a day after conception
C) about a week after conception
D) just after gastrulation

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