The curve on the left shows the height of a rat population in 2007. the curve on the right shows the population in 2010. what type of selective pressure was taking place in this population?

Natural selection took place, causing that rats that were too small to survive in the environment to die off. This means the rats’ genes changed causing their average height to grow to better suit their environment.

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.