Ques: Q: What is the upper most level of earth's layers called? Choices: - surface - volcanic - mantle - crust A:
Ans: crust

Ques: Q: By 180 million years ago, pangaea began to do what? Choices: - combine - freeze - grow - break up A:
Ans: break up

Ques: Q: What is the sum of all biochemical reactions in cells called? Choices: - respiration - diffusion - evolution - metabolism A:
Ans: metabolism

Ques: Q: What gland is a butterfly-shaped organ located in the neck anterior to the trachea? Choices: - pituitary gland - pineal gland - adrenal gland - thyroid gland A:
Ans:
thyroid gland