What theme is conveyed in "Sister and Brother”?

Self-interest is the key to a good life.
Being helpful to others is its own reward.
It is not possible for people to truly change.
The road to doom is paved with good intentions.

surface modification is a versatile tool and has been widely used in material science and engineering that has significantly facilitated the study and characterization of complex materials. at  matexcel, experienced experts in surface science can offer tailored efforts to meet the specific needs from our clients.

black

lasagna

lunch

math

the correct answer is anaphylaxis.

anaphylaxis is a condition caused by insect bites, foods, medications, manifested by tongue swelling, shortness of breath, vomiting, low blood pressure. it sometimes may occur without an obvious reason. it is treated with epinephrine injection.other tretments include antihistamines and steroids,