All plants have a 2 part life cycle that includes a haploid phase and a diploid phase. we call this life cycle question 2 options:

The answer is; alternation of generation.

The haploid phase is represented by the gametophyte while the diploid phase is represented by the sporophyte. Lower plants (such as liverworts and mosses) have a dominant haploid phase while higher plants (such as angiosperms and gymnosperms) have a dominant diploid phase.

it enhances antibody production by t cells of the adaptive immune system.

hope i'm right

explanation:

maritime tropical may be your answer.