Heat is most closely related toenergy.

Thermal energy.

Explanation:

Thermal energy can also be referred to as  heat energy. It is produced when  certain rise in a temperature makes some  atoms and molecules to drive faster and hit against each other. The said energy that emanates from the temperature of the heated substance is known to be thermal energy.

In an ecosystem, usually water from a nearby river or lake is pumped in and used for a cooling process. This causes an increase in the temperature of the water, causing less oxygen to dissolve in it. Many types of fishes which have a small tolerance range for oxygen dies off in this process.

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.