Please answer all questions

1		_________ is a new branch of science that studies all aspects of biodiversity with the goal of conserving natural resources.
			A)	Human biology
			B)	Conservation biology
			C)	Agronomy
			D)	Wildlife management
2		What ethical principle is supported by conservation biology?
			A)	biodiversity is desirable for all living things, including humans
			B)	extinctions due to human actions are undesirable
			C)	biodiversity has value unto itself
			D)	All of these are correct.
3		What percentage of all living species will go extinct within the next 20 to 50 years from human activities if steps are not taken to conserve species?
			A)	1-2%
			B)	5-10%
			C)	10-20%
			D)	50-75%
4		Why is genetic diversity within a population important?
			A)	so the population is less susceptible to disease
			B)	so individuals of the population can survive when the environment changes
			C)	so museums can have more realistic collections
			D)	Both A and B are correct.
5		Habitats with usually high numbers of species are referred to as _______.
			A)	heterogenous
			B)	divergent
			C)	biodiversity hotspots
			D)	multiform
6		Why is biodiversity valuable and desirable to humans?
			A)	for medicinal purposes
			B)	for agricultural diversity
			C)	for consumptive use
			D)	All of these are correct.
7		Which of these is not an indirect value of biodiversity?
			A)	runoff from natural ecosystems pollutes sources of fresh water
			B)	regulation of the climate
			C)	prevention of soil erosion
			D)	participation in biogeochemical cycles
8		What activity does not constitute habitat loss?
			A)	highway construction
			B)	forest fragmentation as new towns are built
			C)	converting wetland into housing areas
			D)	None of these is correct.
9		What percentage of coral reefs have already been destroyed?
			A)	10%
			B)	25%
			C)	60%
			D)	100%
10		Humans have introduced alien species into the environment in all these ways except _________.
			A)	genetic engineering
			B)	human colonization of new areas
			C)	horticulture and agriculture
			D)	accidental transport
11		What statement is true about pollution?
			A)	pollution is any environmental change that adversely affects living things
			B)	pollution is the third main cause of extinction
			C)	pollution can lead to disease
			D)	All of these are true about pollution.
12		Eutrophication is caused by runoff containing nutrients that does what to kill fish in a lake?
			A)	algae overproduce and die; bacteria use up all the oxygen so fish die
			B)	algae overproduce and crowd out fish and other species
			C)	fish overproduce and eat all possible sources of food then starve
			D)	algae overproduce oxygen, which is toxic to fish in high quantities
13		What organism is near extinction due to overexploitation?
			A)	exotic pets
			B)	rare cacti
			C)	Siberian tiger
			D)	All of these are correct.
14		Extinction of the _________ of a community could lead to the extinction of other members of the community.
			A)	decomposers
			B)	primary consumers
			C)	keystone species
			D)	numerically dominant species
15		A _________ is a population divided into smaller groups by habitat fragmentation.
			A)	source population
			B)	keystone population
			C)	metapopulation
			D)	sink population
16		The edge effect _________ the amount of habitat typical to an ecosystem.
			A)	increases
			B)	reduces
			C)	enhances