<span>It is a membranous sac attached to an embryo, functioning as the circulatory system of the human embryo before internal circulation begins until about 3 weeks of age if I recall. It also forms the umbilical cord. A collet is used for clamping purposes. It forms a collar around an object, and clamps down on it as it is tightened. A 5C collet has external threads used for lathes..</span>
In the 9th century, it was suggested that when organisms change, they are adapting to survive.
Lamarck, was the researcher that created the theory of acquired characteristics.
Malthus first proposed the idea that overpopulation <span>contributed to the lack of resources and interfered with survival, but he applied this to only humans, Darwin was the first to apply this to all organisms.</span>
The answer to this is multicellular. Unicellular organisms' life processes all take place in the one cell which is their entire being - their entire existence - whereas multicellular organisms require specialized organs and organ systems to keep us alive.
Answer.
B. Multicellular
<span>muscle cells are animal tissue and therefore cannot undergo photosynthesis. ATP is created by mitochondria, these mitochondria use an electron transport chain to slowly oxidize glucose. The electron transport chain increases the proton concentration on one side of the membrane. ATP synthase uses this proton gradient to form ATP from ADP. This process is called cellular respiration</span>
