Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?
100
It is unsafe to drink.
If a body has high turbidity levels, what can most likely be concluded?
100
Producing energy using hydroelectric plants.
Which would least likely have an impact global climate changes?
100
It is needed to repair tissue.
Why is protein an important part of a healthy diet?
100
Viruses can mutate from year to year.
Why do doctors suggest that people get a flu vaccine each year?
200
N and P.
Which pair of elements has the most similar properties? (Use periodic table)
200
During a chemical reaction, the total amount of matter stays the same.
How does a balanced chemical equation satisfy the Law of Conservation of Mass?
200
Competition.
Kudzu vines grow by climbing and wrapping around trees. Trees covered by kudzu can die because they are starved of sunlight. What type of relationship exits between the trees and the kudzu growing on them?
200
Getting a vaccination.
Which is the best way to prevent the flu from becoming a pandemic?
300
6 atoms of carbon (C).
If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?
300
The land drained by a river and its tributaries.
Which best describes the characteristics of a river basin?
300
Grass.
Which would have the most energy: hawk, grass, mouse or grasshopper?
300
By reducing the need for countries to import food.
Which is a way the agricultural biotechnology industry could have a positive impact on the environment?
400
Nitrogen increases protein production in plants.
Which best explains the importance of nitrogen in the cycling of energy and matter?
400
Environmental Protection Agency (EPA).
In the United States, which is responsible for ensuring the safety of the country's drinking water?
400
The fox's genes.
In the winter, the fur of the artic fox is white. In summer, the fur darkens to a reddish brown. What most likely causes the fur of the fox to change color?
500
Freezing water and burning coal.
Which shows one example of a physical change and one example of a chemical change?
500
Consumers at the top level require more energy than the lower-level consumers.
In a food pyramid, which best explains whyn the number of organisms decreases from one tropic level to the next?