According to the fossil record on Earth, the earliest-known life-forms lived in sea floor rocks about 3.5 ________ years ago.

Underwater avalanches of muddy water mixed with rocks and debris are ______.

Oceanic crust is primarily ______.

Fats that are liquid at room temperature

An enzyme is a type of protein

Glucose is the most important carbohydrate for living organisms

The mitochondria is the organelle used for photosynthesis

Water is able to absorb a lot of heat before the temperature begins to increase. What characteristic of water makes this possible?

Enzymes lower the activation energy of a reaction.

A cell’s interior is considered isotonic to the exterior when: