El siguiente gráfico muestra los niveles de glucosa e insulina en la sangre de un ser humano sobre un período de tiempo
Clave
Concentración
Glucosa
Insulina
Tiempo
Este gráfico representa
(1) una reacción alérgica
(2) una reacción antígeno-anticuerpo
(3) el mantenimiento de la homeostasis
(4) la nutrición autótrofa

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

Greenthe fossil record is the history of life recorded byhuman observationgod. climatologists. remains of the past.

Casts and mold are a type of preservation where the original material decays, leaving a mold in surrounding rock that can be filled with another sediment a. true b. false