Evaluation-Einstein

The Cambrian Explosion, which led to a rapid increase in multicellular organisms, occurred during which era?

• A. Precambrian

• B. Paleozoic

• C. Mesozoic

• D. Cenozoic

Which of the following is a major characteristics of invertebrates?

• A. They have a backbone

• B. They lack a backbone

• C. They have a closed circulatory system

• D. They always live in water

Which of the following is true about vertebrates?

• A. They all have an open circulatory system>

• B. They all reproduce by laying eggs

• C. They have an internal skeleton (endoskeleton)

• D. They lack nervous system

Which of the following is an example of an invertebrate?

• A. Frog

• B. starfish

• C. Penguin

• D. Shark

What is the primary function of an exoskeleton in some invertebrates?

• A. To store nutrients

• B. To protect and support the body

• C. To help with digestion

• D. To produce offspring