What type of material is often used to make impressions of tool marks?

a. cement mix
b. dental paste
c. porcelain clay
d. plaster of paris

a chair, a bed, and a toothbrush

explanation:

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

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.