Answer:
Enzymes allow activation energies to be lowered.
Explanation:
Enzymes are biological catalysts. Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering the activation energy.
Answer:
carbon dioxide is released during leaf respiration (intake of oxygen), but it is quickly reabsorbed during photosynthesis.
Explanation:
Answer:
If no icy debris had arrived, the Earth would have released water from volcanic outgassing.
Answer:
much in common!
Explanation:
Birds, crocodiles and dinosaurs have much in common – including, it turns out, their breath. The hyper-efficient breathing system of birds is shared with alligators, and probably evolved in archosaurs, the common ancestor of crocodilians, birds and dinosaurs.