During swallowing,
a) the tongue flattens to the bottom of the mouth.
b) smooth muscle in the esophagus contracts slightly.
c) salivary secretions stop. the hard palate rises to close the nasal passages.
d) the epiglottis bends to close the trachea.

the answer is b it comes down to b and c for me

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.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.