Which of the following is not a way in which carbon gases are introduced into the atmosphere?
a forest fires
b. respiration
C. photosynthesis
d. burning of fossil fuels

How does the study of genetic disorders such as pku biologists understand normal alleles?

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.

This diagram shows how seed plants are grouped. which is the missing label? bryophytes angiosperms pteridophytes monocots