The poison dart frog can have bright green, red, blue, or yellow skin that secretes a poisonous substance when it feels threatened. which type of adaptation does this describe? mimicry warning coloration camouflage chemical defense

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.

Which of the following is a true statements about viruses? viruses have no nucleus. viruses are alive. viruses have a cell membrane. all viruses are deadly.