Enzymes speed chemical reactions by

a. decreasing amount of energy needed to start a reaction

b. increasing the amount of energy needed to start a reaction

c. adding heat to the reaction

d. removing heat from the reaction

According to the big bang theory, after the "bang," the universe remained dark until about  300,000 yearsone billion yearsthree minutesthree billion years  later, when neutral atoms began to form.

Sort the examples by the type of diversity that they exhibit a park has 80 species of trees red, yellow, and orange bell peppers are all members of the same species individuals of the same lizard species have different mating strategies. five different bird species are at a bird feeder. genetic diversity species diversity

This is a scaffolding of protein fibers that us sell keep it shape in a cell division and cell movement