Answer:
Enzymes are biological catalysts which speed up biochemical reactions.
Adaptation is a phenomenon that is about adjusting certain features to environmental conditions. Ie. birds are adapted to flight as they possess wings, very efficient lungs etc. or tropical plants are adapted to high temperature and humidity as they modified their photosynthesis process. but if some creature is adapted to the specific habitat or conditions, it is hard for it to manage in another habitat/different conditions. ie. birds are fast in the air but on the ground they are quite weak and prone to predators' attacks.
The tadpole would die out. Which would cause the sudden decrease I duck and frog.
If the lizard was a less desirable female/male in a time where their gender outnumbered the other and therefore not all of them get a mate.
When writing a hypothesis, you need to be able to say IF this, THEN this will happen.
