How does the structure of the plasma membrane serve the needs of the cell? - It is impermeable to solids, allowing only liquids and gases to pass through it.
- It is dense and rigid, protecting the cell from external changes.
- It is embedded with proteins, which permit the passage of certain materials.
- It is made up of lipids, which tend to repel water, so water cannot pass through it.

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answer: b. nucleolus

explanation: nucleolus is a structure in the nucleus are ribosomes are made.

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: d

-charlie

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: d

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

the answer would be d : p