Chemistry
What evidence shows a precipitate formed during a reaction?
A solid forms
Which nutrient provides quick energy?
Carbohydrates
A tick feeding on a dog is what type of symbiotic relationship?
Parasitism
High turbidity indicates water is _____.
Cloudy/polluted
What theory explains that continents were once joined together?
Continental drift
Which is evidence of a chemical reaction: melting, cutting, bubbling, or freezing?
Bubbling
What process releases energy from glucose?
Cellular respiration
In an energy pyramid, which level contains the MOST energy?
Producers
What is the main purpose of water treatment?
Remove contaminants/pathogens
In undisturbed rock layers, which layer is oldest?
Bottom layer
Which equation is balanced?
A) H₂ + O₂ → H₂O
B) 2H₂ + O₂ → 2H₂O
C) H₂ + 2O₂ → H₂O
B
Which disease-causing agent cannot reproduce without a host cell?
Virus
Grass → rabbit → snake → hawk is an example of what?
Food chain
What is an aquifer?
Underground layer storing freshwater
Why are index fossils useful?
They help determine relative age of rocks
Sodium (Na) and potassium (K) are in the same group.
What property would they MOST likely share?
Similar chemical properties/reactivity
Which statement BEST explains why fats are important to organisms?
They store long-term energy
Which abiotic factor would MOST directly affect plant growth: sunlight, bacteria, fungi, or insects?
Sunlight
Why do ocean currents form?
Differences in density and temperature
Organisms with traits that improve survival are more likely to reproduce. This describes what process?
Natural selection
A student mixes two clear liquids. The mixture becomes warm and forms a gas. What conclusion is BEST supported?
A chemical reaction occurred
During cellular respiration, what happens to glucose molecules?
They are broken down to release energy
A decrease in rainfall causes plants to die. What is the MOST likely effect on herbivores?
Herbivore populations decrease
A water sample has low dissolved oxygen and high nitrates. What conclusion is BEST supported?
Water pollution/algal bloom likely present
Two fossils are found in different locations but in the same rock layer and share the same index fossil. What can scientists infer?
The rock layers are the same relative age