When a river enters a lake or an ocean, it slows down, losing its capacity to carry sediments, forming: ?

When a river enters a lake or an ocean, it slows down, losing its ability to transport sediments, forming a delta

Explanation:

The rivers transport sediments from birth to discharge to the sea or lakes. At the mouth you can accumulate many amounts of sediment forming a fan-shaped delta. Some of the deltas, such as the Amazon River Delta, the Grijalva River Delta, the Nile River Delta, etc., should be noted as examples. We can know three types of deltas: the deltas by the action of the rivers, by the action of the waves and by the action of the tides.

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explanation:

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.