Fossils may be
A. formed when plant resin or tar preserves the specimen.
B. formed when organic matter is replaced by minerals, turning to stone.
C. All of the answer choices are correct.
D. from impressions left after an organism decays.
E. casts from footprints that have filled with mud and then turned to stone.
C. All of the answer choices are correct.
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Skeletal muscle cell development is controlled by _______ proteins
A. homeobox B. basic domain C. Hox D. myogenic bHLH
In arid terrestrial environments, salt can accumulate in the soil because of
A. the selective uptake of water by plants. B. the activities of grazing animals. C. the precipitation of salt from dry air. D. the secretion of salt by plants. E. the settlement and evaporation of water.
Female secondary sexual traits, such as functional breasts and fat deposits around the hips and thighs, are determined
by _____.
a. the presence of the master gene, SRY b. increased concentration of gene products from the two X chromosomes c. absence of gene products from the Y chromosome d. sex hormones e. maternal influence
A coccus is a(n) ____
a. rod-shaped bacterium b. spherical bacterium c. multicellular bacterial colony d. spiral-shaped bacterium
e. bacteriophage