The cell membrane is semi-permeable, kind of like a filter to let some molecules in and keep larger molecules out
Usually blood transports nutrients
The answer is C. Because when you write an hypothesis you’re thinking about what might occur during and after the experiment. And your experiment must have independent, dependent, and control variables.
Answer:
Example of natural active immunity is fighting off cold and artifical active immunity is building up a resistance to a disease due to immunization and allergic reaction is an response to antigen resulting from active immunity
