Which of the following statements about tolerance range is true? a. tolerance range is different for different organisms. b. the tolerance range is the total number of organisms that can be supported by an ecosystem. c. tolerance range is affected by biotic factors in an ecosystem. d. the available water supply does not impact an organism’s tolerance range.

a. Tolerance range is different for different organisms

Explanation:

The tolerance range represents the upper limit of the supply of environmental resources. Any environmental factor beyond the tolerance range of an organism adversely affects the viability of the organisms.

The range of tolerance for each environmental factor varies for different species. Even organisms of same species also exhibit a different range of tolerance for an environmental factor.

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.