Biology
As an infant, the ability to produce antibodies is

The same as an adult
About 80% of that of an adult
Nonexistent
Limited

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Biology
Which is not a function of the cell membrane?

Keeps materials within the cell separated from the environment outside the cell
Helps control the movement of materials into and out of the cell
Allows the cell to change shape under pressure
Helps substances pass from the cytoplasm into the nucleus

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Biology
Plants are killed in winter by frost

because respiration ceases at such low temperature
because there is no transpiration
because of desiccation and mechanical damage to the tissues
because no photosynthesis takes place at such low temperature

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