What best explains how periods on the periodic table are organized?
100
a parasite
Malaria is a common disease in many countries. What is the cause of this disease?
100
Competition strengthens while the population contracts.
What happens to a population and to competition when there is a reduction fo living space?
200
Gases were released to the atmosphere.
What explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?
200
by reducing the need for countries to import food
What is a way the agricultural biotechnology industry could have a positive impact on the environment?
200
the land drained by a river and its tribuaries
What best descibes a river basin?
200
competition
Kudzu vines grow by climbing and wrapping around trees. Trees covered by kudzu can die becuase they are starved of sunlight. What type of relationship exists between the trees and the kudzu growing on them?
300
6 atoms of carbon (C)
If a chemical reaciton such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?
300
It is needed to repair tissue.
Why is protein an important part of a healthy diet?
300
the Theory of Biologic Evolution
What do transitional fossils best support?
400
Nitrogen increases protein production in plants.
What best explains the importance of nitrogen in the cycling of energy and matter?