A student created a list of characteristics related to chemical reactions, products, and reactants. Identify the incorrect characteristic. A.
In a chemical reaction, reactants can form entirely new compounds.
B.
In a chemical reaction, reactants can either combine or break down.
C.
In a chemical equation, the arrow points to the reactants.
D.
In a chemical equation, the reactants and products must always be balanced

answer:   option a) glucagon was secreted by his pancreas before he ate the cookies because blood glucose was low. insulin was secreted after he ate the cookies because his blood glucose was high.

explanation:

the answer will be a) proteins i believe

osteogenesis imperfecta (oi) refers to a congenital ailment of bones. in the condition, the bones become brittle or fragile. this ailment is a general result of the defect or mutations in the genes (colia1 or colia2). this mutation results in imperfect collagen formation either in quantity or quality wise.  

there are eight kinds of oi defects, and each kind varies with certain distinctions in symptoms. the usual symptoms include frequent bone fractures, loss of hearing in infants, protruding eyes, discoloration of the white in the eyes, respiratory issues, loosening of the joints, short stature, and other symptoms.