Crabby the crab lives in the ocean just off the east coast of the...

Crabby the crab lives in the ocean just off the east coast of the United States. One day, a

young child catches Crabby and wants to take him home as a pet. The child's family had a freshwater pond in their backyard, and the child plans to allow Crabby to live in the pond. Using your knowledge of diffusion, osmosis, and tonicity, explain why the move to the freshwater pond will be deadly for crabby.

B) Concisely describe the fluid mosaic model of plasma membrane. Do not draw a picture.

C) Consider the histamine producing cells of the immune system and innate immune cells such as macrophages. Which process, endocytosis or exocytosis, is more important in each cell type? Explain your answer.