The answer to 1 and 2 is
fishing using cyanide and dynamite, pollution from sewage and agriculture, massive outbreaks of predatory starfish, invasive species.
No, dinosaurs did not exist in the pre-cambrian period
Gene duplication, mutation, or other processes can produce new genes and alleles and increase genetic variation. New genetic variation can be created within generations in a population, so a population with rapid reproduction rates will probably have high genetic variation.
The process likely to be occurring in the plant's roots will be nitrogen fixation.
<h3>What is nitrogen fixation?</h3>
It is a process whereby atmospheric nitrogen is converted to usable forms of nitrogen in the soil.
Nitrogen fixation takes place in the root nodules of leguminous plants in association with some symbiotic bacteria.
Thus, the only process that could be happening in the plant's root is nitrogen fixation.
More on nitrogen fixation can be found here: brainly.com/question/19938608
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