What are the different ways in which animals reproduce sexually? How can their behavior increase their chances of reproducing?

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

The lineage of pea plants produced round seeds for four generations. the plants that fertilized these pea plants also produced round seeds. however, in the fifth generation, the plant produced to two plants with wrinkled seeds. can that be possible?