When Life First Evolved the Oceans Were

question 28

Multiple Choice

When life first evolved the oceans were

• A)hotter and there was more oxygen than today.
• B)hotter and there was less oxygen than today.
• C)cooler and there was more oxygen than today.
• D)cooler and there was less oxygen than today.

---

Definitions:

Sharpey Fibers

Thick collagen fibers that anchor periosteum (the outer fibrous layer of bone) to the bone, playing an important role in the attachment of tendons and ligaments to bones.

Periosteum

A dense layer of vascular connective tissue enveloping bones except at the surface of the joints.

Collagen Fibers

Strong, fibrous proteins that make up connective tissues, providing support and strength.

Carpal Bone

One of the eight small bones that make up the wrist (carpus) that connects the hand to the forearm, allowing for the wrist's complex range of movement.