*Question*
You are presented with the question "What does an animal require for survival?" and the following answer choices: - layer of body fat under skin - A compound that donates proton - Molecular kinetic energy - mineral particles and organics - a complete digestive system - converting food to energy - keeping food fresh for long periods of time - Something made primarily of oxygen and nitrogen Now knowing that an animal requires air for survival and air is primarily oxygen and nitrogen, choose the best answer.
**Answer**
Something made primarily of oxygen and nitrogen

*Question*
You are presented with the question "What is the chemical element with symbol N and atomic number 7 found in?" and the following answer choices: - Chlorophyl - Petals - Mitochondria - A Greek letter - Cytoplasm - acetic acid - Acids - fossil fuels Now knowing that nitrogen is found in proteins, nucleic acids, and chlorophyll and absorption of nitrogen by plants is part of the nitrogen cycle , choose the best answer.
**Answer**
Chlorophyl

*Question*
You are presented with the question "what have a negative impact on water quality?" and the following answer choices: - CFCs - oxygen - hydrogen - oil - h2o - mines - fungi - Cars Now knowing that acid rain has a negative impact on water quality and acid rain is partly caused by CFCs, choose the best answer.
**Answer**
CFCs

*Question*
You are presented with the question "Flowers require" and the following answer choices: - water to grow - Electrical energy - sunlight - water to excrete waste in - water to reproduce in - flow of electrons - genetic diversity - water to take root in Now knowing that aplant requires water to grow and first flowering plants appear, choose the best answer.
**Answer**
water to grow