Q: Management programs based on population-regulating factors have helped prevent the extinction of many? Read this paragraph and choose the correct option from the provided answers: Choices: - abundant species - keystone species - omnivores - endangered species A:
endangered species

Q: What determines velocity? Read this paragraph and choose the correct option from the provided answers: Figure 28.14 Classically, velocities add like ordinary numbers in one-dimensional motion. Here the girl throws a snowball forward and then backward from a sled. The velocity of the sled relative to the Earth is relative to the Earth is. Choices: - direction - change in direction - mass per unit - distance over time in a given direction A:
distance over time in a given direction

Q: The nitrogen cycle moves nitrogen back and forth between the atmosphere and what? Read this paragraph and choose the correct option from the provided answers: The nitrogen cycle moves nitrogen back and forth between the atmosphere and organisms. Bacteria change nitrogen gas from the atmosphere to nitrogen compounds that plants can absorb. Other bacteria change nitrogen compounds back to nitrogen gas, which re-enters the atmosphere. Choices: - Ocean - Ozone Layer - sediments - organisms A:
organisms

Q: A catalyst decreases the amount of what resource that is required in order to begin a chemical reaction? Read this paragraph and choose the correct option from the provided answers: Catalysts are not reactants, but they help reactants come together so they can react. You can see one way this happens in the animation at the URL below. By helping reactants come together, a catalyst decreases the activation energy needed to start a chemical reaction. This speeds up the reaction. Choices: - positive energy - motion energy - kinetic energy - activation energy A:
activation energy