In humans, which receptor is used primarily to detect light?
A. photoreceptor
B. proprioceptor
C. chemoreceptor
D. mechanoreceptor
E. electroreceptor
A. photoreceptor
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An atom with more protons than electrons is called a(n) __________. Fill in the blank(s) with the appropriate word(s)
Some biologists are considering adopting a different classification scheme based on common ancestorscalled:a
BioDiversity. b. the biological BarCode. c. the phylogical guide. d. the molecular blueprint. e. PhyloCode.
A mature ovary, specialized as a vessel that houses and protects seeds, is a
A) fruit. B) ovule. C) cotyledon. D) seed coat.
Sympatric speciation differs from allopatric speciation because in sympatric speciation
A. there are no physical barriers against interbreeding. B. a population becomes geographically isolated. C. hybrid zones form. D. polyploidy must first arise. E. two populations of the same species merge to form a single population.