11. memory t cells (select all that apply.) a. must all be activated in secondary lymphoid organs b. do not require co-stimulation through cd28 c. are composed only of cd4 t cells d. do not undergo somatic hypermutation e. are usually short-lived f. do not undergo isotype switching.

Activated by the binding of an antigen to a specific matching receptor on its surface, a B cell proliferates into a clone.

correct answer: biotic and abiotic limitations

carrying capacity is defined as the total number of an organism who can be supported in a given area within the natural resources limit and without harming or degrading the natural, economic or the cultural environment present for the future generations.

carrying capacity is determined by the limiting factors, which are known to affect the natural resources available. it may include water, nutrients, minerals, space, light etc.

explanation:

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compost can be added to topsoil as a:

pesticide