<span>There are three major groups of mammals, categorized on the basis of their method of reproduction. Monotremes lay eggs to have children instead of having the mother bear them. The second type of mammal is the marsupial, which are non-placental animals who carry their young in their pouches. Eutherians are the third group who are placental mammals.</span>
During longer space exploration trips, all of the medical concerns are due to the absence of gravitational force. Crewmembers may develop short-term conditions which are reversible. Those conditions include: vision impairment risks and short-term cardiac atrophy, increase in length, weight loss, vestibular dysfunction etc.
On the other side, the long-term medical condition is loss of bone mineral density (negative calcium balance) and radiation exposure which are irreversible.
During endocytosis the plasma membrane folds inwards either through phagocytosis for solits or pinocytosis for liquids.
During exocytosis vesicles for the inside of the cell fuse with the membrane and are released outside of the cell.
<span>A protozoan that divides to form two daughter cells just like itself would be undergoing "Binary fission".
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