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A virus is an example of a pathogen. Pathogens also include bacteria, fungi or protists, and all are capable of causing infectious disease. Viruses are very small, much smaller than bacteria. They consist...

the points you need to get accross here are;

-on a warm day, there will be more evaporation from the plant,

-therefore the guard cells will close around the stomata so that the plant will no...

The breathing rate increases at the start of exercise then reaches a peak and plateaus during exercise. After exercise the breathing rate will gradually fall, but this may take several minutes.

Dur...

The nucleus is where the genetic information of the cell is stored as DNA; the instructions for the cell's activity. The mitochondria provide energy for the cell through the process of respiration, and th...

Variation in the population occurs through mutations. Some organisms have advantages that allow them to survive the selective pressure (thus could be Food shortage or predators) Survivors reproduce and pa...