Astudent is trying to match organ systems together according to their functions. which of the following organ systems are best paired in terms of their functions being opposite to one another?

a. immune and integumentary systems
b. nervous and endocrine systems
c. digestive and excretory systems
d. muscular and skeletal systems
e. circulatory and lymphatic systems

equal distribution i think.

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

answer///multiple alleles;