WILL MARK BRAINLIEST select the correct answer from the drop-down menu

What term refers to crops that mainly protect other crops during their early days

(Pasture crops, forage crops, or nurse crops) mainly protect other crops during their early days.
(Peas, corn, or peanuts) is an example of such crops.

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons

What element is able to combine with itself and hydrogen to form large molecules ?