The scientist who first observed the 'cell' under a microscope was: MCQ with Answer and Explanation

Explanation:
Hydra, a freshwater cnidarian, has extraordinary regenerative ability; even small fragments can regenerate a complete organism. This is due to its high proportion of stem cells. Planarians also show remarkable regeneration. Earthworms can regenerate some posterior segments, but not as extensively as Hydra or Planaria.

Explanation:
Marasmus is a form of severe malnutrition caused by a deficiency of both calories and protein. It results in extreme wasting of muscle and subcutaneous fat, making the child look emaciated or 'wasted'. Unlike kwashiorkor, marasmus typically does not present with edema. The child is extremely weak, has a 'old man' face, and is highly susceptible to infections.

Explanation:
The Golgi apparatus receives proteins from the rough ER, modifies them (e.g., glycosylation), sorts them, and packages them into vesicles for transport to the plasma membrane, lysosomes, or secretion. Lysosomes digest, rough ER synthesizes proteins, mitochondria generate ATP.