What is a defining characteristic of members of the Class Testudines?
A. They have a kinetic skull.
B. They lack limbs.
C. They have a four-chambered heart.
D. They have a hard shell.
Answer: D
You might also like to view...
The following steps refer to various stages in transmission at a chemical synapse
1. Neurotransmitter binds with receptors associated with the postsynaptic membrane. 2. Calcium ions rush into neuron's cytoplasm. 3. An action potential depolarizes the membrane of the presynaptic axon terminal. 4. The ligand-gated ion channels open. 5. The synaptic vesicles release neurotransmitter into the synaptic cleft. Which sequence of events is correct? A) 1 ? 2 ? 3 ? 4 ? 5 B) 2 ? 3 ? 5 ? 4 ? 1 C) 3 ? 2 ? 5 ? 1 ? 4 D) 4 ? 3 ? 1 ? 2 ? 5 E) 5 ? 1 ? 2 ? 4 ? 3
Blood plasma transports a variety of substances, including hormones, nutrients, carbon dioxide, electrolytes, and urea. Which of the following statements is INCORRECT regarding these substances?
a. Electrolytes are transported to the cells where they are used to maintain cell volume. b. Urea is transported to the urinary system for removal. c. Nutrients are transported from the digestive system to the body cells. d. Carbon dioxide is transported from the cells to the lungs. e. Hormones are transported from the nervous system to the body cells.
The average human ejaculation contains
a. 120,000 to 400,000 sperm. b. 1,200,000 to 4,000,000 sperm. c. 12 million to 40 million sperm. d. 120 million to 400 million sperm. e. 1.2 billion to 4 billion sperm.
Organisms that are used to decontaminate soils may
a. store the contaminants in their tissues. b. release pollutants into the air. c. degrade the pollutants. d. be any plant species. e. a, b, and c.