Can your body make antibodies for pathogens that you have never been in contact with? why of why not?

Abnormal softening of a gland is known as

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

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?