What are the intercellular communication types at a synapse? select all that apply.
a. soups - chemical synaptic transmission
b. sparks - chemical synaptic transmission
c. soups - direct electrical communication
d. sparks - direct electrical communication

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

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.