Early cleavage divisions in most embryos are also rapid. One reason for this is that cleaving cells have a modified cell cycle, in which the two gap phases, G1 and G2 are completely omitted, and the cells cycle rapidly between M and S phases. In addition, because the major cytoskeletal systems of the cells are largely devoted to mitosis (microtubules) and cytokinesis (microfilaments) during rapid cleavage division, there is typically an antagonism between periods of rapid cell division and cell movement. Thus as the embryo approaches gastrulation, there is a tremendous slowing in the rate of division (note the slope of the curve at the right).
Allows them to stretch and compact when needed
Answer: No light = emanate unescapable death if that is your question
Explanation: If starvation doesn't kill you some other person trying to survive will now if you will excuse me I am going to go tell someone else the harsh reality we all live in
Global warming is an issue to organisms or species because not all animals can adapt so certain living conditions. high human population growth rate drive further extinctions of plants and animals because humans need space to live so we cut down their habitats and they die. not all animals can adapt to certain living conditions.
