A marine biologist observed an organism. It had openings on its body through which food particles and water passed. Which phylum does the organism belong to?

Cnidaria

Porifera

Platyhelminthes

What does each band in a gel electrophoresis represent

When do divergent boundary occurs

What is the driest biome on earth

When performing a biceps curl, tension in the biceps brachii muscle increases. Which of the following structures detects and responds to the tension by reflexively reducing muscle activation? a. Golgi tendon organ. b. Muscle spindle. c.

What is the first step in an autopsy? A. Dissect the body B. Examine the internal organs C. Conduct an external examination D. Identify the victim

A scientist is testing the effectiveness of Drug X on cancer. She gives a small amount of the drug to the mice that have cancer.

The genome of the pufferfish, Fugu rubripes, is only one-tenth the size of mammalian genomes. Which of the following most likely accounts for this difference? Choose one: A. movement of mobile genetic elements B.

A genetic factor that blocks another genetic factor

What property of light waves explains the appearance of the pencil under water?

Which statement is false? Organ rejection is a big risk in patients with organ transplants. Donor organs are treated with disinfectants and antibiotics before they are placed in the recipient.