Which fact represents evidence for the big bang theory?
A.
Every object located in the universe emits radiation.
B.
The mass that makes up the universe consists of 25% helium.
C.
The Sun around which Earth revolves is not the biggest star in the universe.
D.
Human eyes cannot perceive all forms of electromagnetic radiation.

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit.there is a precise compatibility between the active site and the lactose molecule.specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed.reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.

How is anaerobic respiration affected by changes in temperature? (5 points)based on the conditions of early earth, what conclusion can you draw about the amount of anaerobic respiration that was occurring at earth’s beginning? explain your answer.(5 points)if there was a sudden drop in temperature after the evolution of the first living cells, predict how that might have affected the changes in the atmosphere and the evolution of cyanobacteria and other autotrophs. explain your answer. (5 points)