What is the process of succession? O. A. When a species changes from one niche to another niche
© B. When a community is replaced by another community
• C. When one disturbance replaces another disturbance
D. When an ecosystem changes from one biome to another biome

a- all cells come from pre-existing cells

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

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,