Which task would an environmental scientist most likely perform? -determining the age of rocks in a canyon -testing the water in a stream for contaminates -studying the weather patterns in a particular climate -evaluating floodplains to determine the risk of flooding

- studying the water in a stream for contaminates

Explanation:

The environmental scientists have their focus on the conditions of the nature, be it positive or negative. They are mostly concerned about the well being of the environment, as there are numerous sources that destroy and pollute it, with the humans being the reason why those sources are doing that. Studying the water in a stream for contaminants is exactly a thing that an environmental scientist will do. The quality of water will be checked, and there will be official results about it in most cases. If the water is contaminated, the environmental scientist has the duty to alarm the authorities and the people about the problem, find solution, and force the polluters to stop with the pollution.

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.