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Science exam

Terms in this set (20)

Snowshoe hares experience a change in fur color from brown in the summer
to white in the winter. Would it change fur color if it lived in a warm desert
like climate?
Brown all year long
Different kinds of finches were studied by Charles Darwin on the Galapagos
Islands in the 1830's. These finches were isolated geographically from each
other. According to Darwin, these finches have a common evolutionary
ancestor, but became extinct gradually over time. Darwin concluded that
the differences are most likely due to what?
Types of seeds available
A group of antelope leaving the herd in search of better grassland is an
example of _________________.
Emigration
The series of changes that occur in an area where no soil or organisms exist
is called ____________________.
Primary succession
If two species both benefit from each other for their existence, then the
symbiotic relationship is called ________________.
Mutualism
What is a major cause of extinction?
Habitat Destruction
What is biodiversity?
The variety of all life on earth
In the theory of natural selection, species are most likely to survive if they
____________________.
Variation that makes them adapt to the invorment
9. In this food chain, which organism is a producer?
Grass - grasshopper - mouse - raccoon
Grass
What term refers to the process by which individuals are better adapted to
their environment and are more likely to survive and reproduce?
Natural selection
Which organisms for the base of all ecosystems?
Producer
If an area has all the wolves that it can support, then the wolf population
has reached its _____________.
Carrying Capacity
A farmer decides to leave a certain field alone, and never use it for crops
again. Overtime she notices that one type of plant begins to grow, and then
is slowly replaced by another type. What is this replacement of communities
overtime called?
Succession
Barnacles attach to a whale for feeding, and the whale is neither harmed nor
benefits. What symbiotic relationship is represented?
Commensalisn
The first species to populate an area where primary succession is taking
place are called ________________ .
Pioneer Species
The most useful way to maintain biodiversity is through
________________.
habitat preservation
A relationship in which one organism benefits while the other organism
harmed is called _______________.
parasitism
A behavior or physical characteristic that helps an organism survive and
reproduce is called _________________.
adaption
Organisms that live in deep ocean ecosystems are adapted to
_______________.
little or no sunlight
What limiting factor could cause a decrease in a fish population?
Decrease in food source
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