The oldest eukaryote identified in fossil records is thought to have appeared about ____ million years ago.
Fill in the blank(s) with the appropriate word(s).
Ans: 1.5
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What trait do birds share with reptiles and monotreme mammals?
a. endothermy b. hollow bones c. a cloaca d. nucleated red blood cells
A cotyledon is
A. a nutritional resource for the embryo plant. B. a spore-like structure used for reproduction in plants. C. the first leaf structure to arise in the embryo of an angiosperm. D. a part of the fruit tissues of the plant. E. both a nutritional resource and the first leaf for the embryonic plant.
Which ion is required for proper neurotransmitter release?
a. sodium b. calcium c. potassium d. chloride e. acetylcholine
A breed of chicken shows codominance for feather color. One allele codes for black feathers, another codes for white feathers. The feathers of heterozygous chickens of this breed will be
A) speckled. B) black. C) gray. D) white.