What does the Delta Sign indicates in chemistry ?

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

The reaction q+r2=r2q is found to be first order in r2 and

Monkeys and bats have similar bone structure in their forelimbs. however, monkeys have longer forelimbs to use for climbing and swinging in trees. bats have shorter forelimbs to use for flight. which term best describes how monkey and bat forelimbs are related to each other? a. homologous b. embryonic c. analogous d. vestigial