Afid ialah serangga kecil yang menghisap cecair dalam tumbuhan. Afid memasukkan bahagian mulutnya ke dalam batang tumbuhan dan menyerap nutrien. Namakan cecair
yang diperoleh daripada tumbuhan dan terangkan mengapa afid didapati kebanyakannya
pada waktu siang.​

allowed for the prediction of the properties of missing elements.

answerreferred pain;

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