Both options are valid because they have happened before and can influence the mentioned drop in the population. Toxins in the food chain, just like the increase of water temperature, are easily proven and found and are mostly human made.
If the hypothesis is not supported by the results of the experiment then the hypothesis needs to be abandoned or modified.
If the results does not prove the hypothesis then we can alter the process and then carry the experiment or analyze where did he or she go wrong, write in detail about the data and the results and also change the hypothesis after confirming by performing an altered experiment.
D. Producers/autotrophs can convert energy from the sun into a form that is available for consumers/heterotrophs to use.
2.1 a) nectar b) to produce seeds c) pollen is made in the ovary
