When the north end of earth’s axis is tilted toward the sun, north america will experience
a.
more indirect rays and shorter days.
b.
more indirect rays and longer days.
c.
more direct rays and shorter days.
d.
more direct rays and longer days.

Earth id not not round, in fact is is titled to an angle of 23.5 degrees to its orbital plane and this is the reason why we can not experience days and night of an equal length. Also the varying  seasons is also because of the tilt. The areas exposed to the sun will surely experience direct rays and days will longer, where as the rest of the parts will be having chilly nights and shorter days.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.  

my answer is the prothallium.brainliest