Why is the nucleus similar to the nervous system

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes

What if the yeast were extremely active and produced more than 100ml gas. would you know? why/why not