HEL Changes in ecosystems can be attributed to natural causes, such as natural disasters, seasonal variations in climate, currents, and tidal activity. Many of these changes can affect the amount of food resources
available in an ecosystem. Research one natural change that currently affects or could affect the aquatic
ecosystem you chose. Use your food web model to explain how this change can affect the competition of
food resources in your aquatic ecosystem.

dam building, heavy industry, deforestation, irrigation, agriculture, infrastructure, construction, burning fossil fuels, mining, fishing, there is a few that is what I came up with for the ecosystems, and for the food chains and food webs hunting. Hunting interferes with the food chain because the predators are not getting what they want because humans are hunting. 

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

the answer is c. it will give up it's valence electron to the other atom.