Which of the following chemicals has the LEAST influence on the regulation of breathing rate?
a. O2.
b. CO2.
c. H+.
d. N2.
e. CO.
A
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Shallow marine sediments are dominated by
A) Firmicutes. B) Planctomycetes. C) Proteobacteria. D) Tenericutes.
The pressure at the bottom of a pond does not depend on the
What will be an ideal response?
Which of the following does NOT describe phylum Ascomycota?
A. They are limited to only asexual reproduction. B. Morel mushrooms are members of this phylum. C. The fruiting body is known as an ascocarp. D. They use conidiospores during reproduction.
Early animal embryos are composed of stem cells, unspecialized cells that are capable of dividing and renewing themselves for long periods
If a stem cell divides by mitosis so that one cell eventually becomes part of the brain and the other cell becomes part of a salivary gland, the cells have A) differentiated. B) diffused. C) taken up genes from surrounding cells. D) lost genes. E) increased their genetic variability.