Witch describes a habitat of a frog

Blood is moved through the vascular system by A. valves in the wall of the blood vessels. B. peristalsis caused by smooth muscle in the blood vessel walls. C. pressure gradients created by the heart. D. osmotic pressure. E viscosity of the blood

Which of the following does not occur in an aquatic ecosystem as a result of nutrient loading? a. acidification of the water b. algae growth as a result of eutrophication c. degraded quality of water for human and livestock consumption d.

For an experiment, a scientist plans heat an unknown liquid over a busen burner. which safety measures would be most important for the scientist to follow during this experiment? a. wear protective clothing, such as goggles, gloves, and lab coat. b.

Cyanobacteria were the first photosynthetic organisms. How were they responsible for allowing higher life forms to evolve? A. They released oxygen, which mixed to form iron, and later ferrous oxide, in the air. B.

Bread rises due to the action of fungi called molds. true or false

Identify some abiotic characteristics of the taiga biome

Which of the following statements about female delinquency based on sexuality is false? Select one: a. Girls who experience an early onset of physical maturity are most likely to engage in antisocial behavior. b.

Ammonia, the major etiologic factor in the development of encephalopathy, inhibits neurotransmission. Increased levels of ammonia are damaging to the body. The largest source of ammonia is from:

What structure on the continental crust is most similar to an ocean ridge? -Plains -Mountain range -Canyon -Plateau

Which is the best way to increase the validity of data in an experiment