The wing of a bird and the leg of a horse are very different looking structures. although they look different, bird wings and horse legs are very similar in the arrangement of the bones that make up the limb. which term is used by scientists to describe structures that look different on the outside but are actually similar in construction and develop from the same embryonic tissues?
a) common descent
b) ancillary anatomy
c) vestigial structures
d) homologous structures

Select the true statements about eubacteria. most live as decomposers and heterotrophs. most only thrive in a narrow range of environments. certain eubacteria are responsible for food poisoning. eubacteria thrive in extreme environments.

Why does the earth spin slowly, not faster? is it possible to prove it scientifically? can you prove it with math?

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.