All the cells don't have all of the intracellular structures because each and every cell do not need each and every intracellular structure. The plant cells have chloroplasts because they need to convert the light energy into chemical energy via the process of photosynthesis, the animal cells, however, have no such need, therefore, the animal cells do not have chloroplasts. Also, the erythrocytes do not have the cellular organelles in them which are present in the other body cells, because there is no need for the cellular organelles in them. The large vacuoles in plant cells is also a great example. The plants need the vacuoles for the metabolic processes, while most animal cells have no need for them.
Plankton is the organisms that form the base of most open ocean food webs because fish eat plankton and bigger fish like sharks eat the little fish that eats the plankton.
kidney failure<span>, </span>cancer, and infectious disease such as FIV <span>Cats also suffer from hyperthyroidism, which causes high blood pressure, inflammatory bowel disease, </span>diabetes<span>, arthritis, and dental disease.</span>
As population density increases, competition increases because there are more organisms competing for the same number of resources
