What are two ways variation in the trait could be introduced into the population?

A single mutation can have a large effect, but in many cases, evolutionary change is based on the accumulation of many mutations. I hope this help you

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Explanation:

sia sia sai In a running relay, each runner ran an equal part of the total distance.  Joseph and 3 othe

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.