recover she gets sick again. She also has a very stressful work and family life. What is most likely the cause of Chelsea's constant illness?
decreased lymphocyte production due to chronic stress
Structure X is only found in plant cells, and structure Y is found in plant and animal cells.
Here are the four postulates of natural selection, according to Charles Darwin:
1. variability - refers to different mutations that create different species
2. heritability - refers to the genes that are passed from one organism onto its descendants
3. overproduction of offspring - refers to the fact that more "children" is born than dies
4. natural selection - refers to those organisms that survive because they adapt to their surroundings better than those who will die
It has enhanced our knowledge in the science world greatly. Many cell organelles and chemical processes can be studied in more detail using the electron microscope.
