use the theory of natural selection to explain changes seen in mating calls of the new isolated southern male frogs ?

i think its c. amphipod

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.