The area near shore where freshwater mixes with saltwater is called ____?
an estuary
100
What is an example of a bioindicator?
insect, fish, (an living thing)
100
What process allows scientists to compare rock layers with others in a sequence to determine their age?
relative dating
100
Which geologic era is known as the Age of Reptiles?
mesozoic
100
What is this an example of?
- the forelimbs of humans and bats having the same basic skeletal structure but using them for different functions?
homologous structures
200
What process will occur if humans continue to overload water systems with excess nutrients?
eutrophication
200
Which will best show lakes, rivers, and streams are healthy?
A. large amounts of algae
B. large amounts of nitrates
C. large amounts of decomposers
D. large amounts of dissolved oxygen
D. large amounts of dissolved oxygen
200
What can be used to find the exact age of a rock specimen?
A. ice cores
B. index fossils
C. radiometric dating
C. radiometric dating
200
Divisions in geologic time are based on ___.
major biological and geologic events
200
Is evolution a gradual, extreme or instant change over time?
gradual
300
What contributes most in supporting life on the deep ocean floor?
hydrothermal vents
300
What most directly affects the amount of dissolved oxygen in a body of water?
temperature (cold water holds more dissolved oxygen)
300
Why are index fossils used as guides to determine the age of rocks?
Each index fossil lived during a specific geologic time period.
300
What event ended the age of reptiles?
an astroid
300
Which characteristic of organisms allows them to adapt to changes in their environment?
A. genetic variation
B. genetic isolation
C. genetic drift
A. genetic variation
400
Giant tube worms live on the floor of the Pacific Ocean near hydrothermal vents. Using the data in the figure, how would you best describe their location?
benthic and aphotic zones
400
Reducing water usage through conservation measures is an example of showing good ____.
stewardship
400
What is most likely to provide information about the Earth’s past climates?
ice cores
400
What is the age of mammals?
cenezoic
400
What type of adaptation best allows organisms to adjust to the harsh winters of the tundra?
thick fur
500
Coral reefs require sunlight because reef-building coral contain photosynthetic algae in their tissues. The reefs must sit on the ocean floor for support and must remain underwater to survive. In which ocean zone does a reef most likely thrive?
Neritic
500
How does acid rain change the pH of a water system?
it lowers the pH
500
What role do faults play in the Law of Superposition?
Faults are younger than the layers they cut through.
500
Which period of geologic time is the longest?
precambrian
500
Which can cause an organism to develop genetic variation that could be used to help it survive?