Answer:
<em>C/ a controlled lab experiment with mosquitoes that limits water access for the experimental group.</em>
Explanation:
The scientist is looking for what could cause the decline in the mosquito population and if it is due to the filling of the local pond. To best conduct research on this topic would be to experiment with mosquitoes and their responses with limited water access. It has the two variables, the mosquitoes and water. This is the most effective way of determining his study.
B. Obtain oxygen out of the atmosphere.
The answer is B, decomposers
The correct word to fill the gap is pathogens.
<h3>What are pathogens?</h3>
Pathogens are microbes that are capable of causing diseases or abnormalities in people that are healthy.
Microbes that are not capable of causing diseases are referred to as non-pathogenic.
It is derived from the Greek words "pathos' which means 'suffering' and 'genes' which means 'producer of'.
More on pathogens can be found here: brainly.com/question/18918957
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Spirulina is a type of cyanobacteria. The cyanobacteria are a type of bacteria that have pigments that allow them to photosynthesize. Which organelle allows a plant to photosynthesize?