Neurotransmitters (like acetylcholine) are required to conduct nerve impulses because the neurons do not physically touch each other or the cells on which they are acting.

Early amino acids may have originated a Deep in the crust b At hydrothermal vents C Elsewhere in the solar system d All of these

Farmers sometimes use slash and burn farming techniques, which consist of cutting down and burning forests to make enough room to grow crops.

When people with severe obesity undergo bypass surgery that seals off part of the stomach, the remaining stomach then produces much less?

Select the correct answer from each drop-down menu. Temperate grasslands and are two biomes that are dominated by grass species, share similar wildlife, and have few. However, while temperate grasslands have, the other grassland biome has.

How does each type of organism get the energy it needs for its essential life processes?

In a metabolic pathway, a typical control mechanism is to have:

Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants?

Peter has just had surgery and is on nasogastric suction. this involves removing fluids from the stomach through a tube. the new intern does the suction a little too enthusiastically and removes too much hcl. what do you think will happen to the ph?

The 68-year-old client states, "i have been taking aspirin on occasion for my arthritis for many years but notice that it takes longer for it to start working now." what is the best response by the nurse?

The mid-ocean ridge is formed by the long accumulation of ocean floor sediments and millions of years of their subsequent folding and faulting. a. True b. False