Choose the correct option and justify:
Meiosis:
a- occurs in somatic cells.
b- maintains the chromosome number of a species throughout the generations.
c- conserves the number of chromosomes between the stem cell and daughter cells.
d- separation of sister chromatids.

All phases of matter may have a fixed mass

Which of the following is one way in which organisms such as clown fish and sea turtles are able to overcome the many dangers that their offspring encounter and ensure that their species population numbers stay relatively steady

What are some of the immune functions of the lymphatic system? a. cleaning red blood cells from the blood and creating lymph fluids b. transporting lymph to the tissues and creating lymph fluids c. removing infectious agents and making white blood cells d. making red blood cells and removing infectious agents