Question

cells are the building blocks of all living things. just like your body contains organs, cells contain specialized structures called organelles that perform specific jobs. organelles are suspended in cytoplasm, a jelly - like liquid. to carry out their functions, a cells organelles need a consistent environment. all cells are surrounded by a flexible cell membrane, which separates the cytoplasm and organelles from the outside environment. the cell membrane controls which substances are able to move into and out of the cell. select the true statements. only animal cells have a cell membrane. the cell membrane is rigid. the cell membrane controls what enters and exits a cell. the cell membrane maintains a separate environment inside a cell.

Explanation:

• "Only animal cells have a cell membrane": False. Both plant and animal cells have a cell membrane (plant cells also have a cell wall outside the cell membrane).
• "The cell membrane is rigid": False. The cell membrane is described as flexible in the text.
• "The cell membrane controls what enters and exits a cell": True. The text states "The cell membrane controls which substances are able to move into and out of the cell."
• "The cell membrane maintains a separate environment inside a cell": True. The text says "a cell’s organelles need a consistent environment" and the cell membrane "separates the cytoplasm and organelles from the outside environment", so it maintains a separate internal environment.

Answer:

• The cell membrane controls what enters and exits a cell.
• The cell membrane maintains a separate environment inside a cell.