In what ways can humans change an ecosystem?

The body is protected against harmful flu viruses by

Asap what occurs after cytokinesis is completed at the end of meiosis 1?

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere