HELLP PLS DONT GUESS PLS 7. In unicellular organisms, life functions
are performed by
a) Tissues
b) Organelles
c) Organs
d) Organ systems

Which is an example of a vestigial structure? a: paw of a lionb: wing of a birdc: appendix of a humand: tail of a cat(i think it's a but i'm not sure)

Achemical that is released by an animal as a signal to other members of the same species is called a pheromone. t or f

Which of the following are not matched correctly? cd8+: directly destroy infected or cancerous cells t reg cell: reduce the adaptive response once threat passes t l: activate cellular branch (cytotoxic t cells, macrophages, nk cells) t 2: stimulate b cells to make antibodies t (cd4+): mhc i