What environmental conditions contributed to the development of trilobites and other multicellular organisms at the beginning of the phanerozoic eon? developing continents deep, cold oceans warm, shallow seas atmospheric dust
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Which of the following explains why a tree is often used as a model to represent the principle of common descent

Question 1 which of the following allows cells to take in fluids? a. phagocytosis b. pinocytosis c. exocytosis d. receptor-mediated endocytosis question 2 molecules move along their concentration gradient (from areas of high concentration to low concentration) using active transport mechanisms. a. true b. false question 3 which of the following powers active transport (ie. provides the energy for)? a. glucose b. transport proteins c. atp d. phospholipids question 4 what type of lipid is a major component of the plasma membrane? a. cholesterol b. phosopholipids c. proteins d. triglycerides