The earth
guided practice
pollution that runs off the land often combines with sediments at the bottoms of bodies
of water. in this way, fish may become poisoned.
this is an example of how fish interact with the
a. atmosphere
b. ecology
c. lithosphere
d. hydrosphere

i believe the correct answer is d

the real answer is b. scintillation counter

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.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?