Current research suggests that - both the trichromatic and opponent-process theories are valid in explaining color vision. - the young-helmholtz theory best explains how we experience color. - both the young-helmholtz and the opponent-process theories are wrong in explaining color vision. - frequency theory shows promise in explaining how we experience color vision. - opponent-process theory is the most comprehensive theory for explaining color vision.

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Food webs - transferring energy and matter from one level to another. here you see four food webs. one or more are incorrect. which food web(s) show the correct sequence of organisms, from start to top level consumer? a) a b) d c) c d) a and d

14) whenever diploid populations are in hardy-weinberg equilibrium at a particular locus a) the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change. b) natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency. c) this means that, at this locus, two alleles are present in equal proportions. d) the population itself is not evolving, but individuals within the population may be evolving.