Tcells are part of ) a group of phagocytic white blood cellsb) cell-mediated immune responsesc) the complement systemd) innate immunitye) the first cells to bind to antigens

a group of phagocytic white blood cells

Explanation:

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.