Which of the following facts might be related to polar climates? A) Solar energy hits these regions at a low angle
B)Year round temperatures are always hot
C)These regions lie between latitudes 23 north and 23 south
D)Temperatures in these zones are moderate

i think the answer would d

a- multicellular

b-eukaryotic

c-no cell wall

d-heterotrophic

e-autotrophic

answer;

-vessels in the chest

the diagnosis of angina pectoris literally means "vessels in the chest"

explanation;

-angina pectoris is the medical term for chest pain or discomfort due to coronary heart disease.it is the chest pain due to an inadequate supply of oxygen to the heart muscle. the pain is typically severe and crushing, and it is characterized by a feeling of pressure and suffocation just behind the breastbone.

agina pectoris is caused by reduced blood flow to your heart muscle. the blood carries oxygen, which the heart muscle needs to survive. when the heart muscle isn't getting enough oxygen, it causes a condition called ischemia