Populations And Communities Part 1: Question Preview (ID: 23765)

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Students counted 75 sand crabs in a 5-meter by 3-meter section of a beach. What was the population density of sand crabs in that section?
a) 75/3= 25 so the population density is 25 crabs per square meter
b) 75/5= 15 so the population density is 15 crabs per square meter
c) 75/8=9.375 so the population density is 9.375 crabs per square meter
d) 75/15= 5 so the population density is 5 crabs per square meter

Water, sunlight, and oxygen are examples of ____ factors in ecosystems.
a) abiotic
b) biotic
c) limiting
d) carrying

Every organism has a variety of ____ that enable it to live successfully in its environment.
a) adaptations
b) habitats
c) niches
d) styles

An organism's specific role in its habitat is called its ____.
a) name
b) livelyhood
c) niche
d) right

All the different species living in an area form a ______.
a) community
b) family
c) population
d) ecosystem

If a population is very large or spread out, ecologists use the ____ method to estimate the population size.
a) counting
b) guessing
c) sampling
d) tabulating

An interaction in which one organism kills and eats another organism.
a) commensalism
b) mutualism
c) parasitism
d) predation

Behaviors and physical characteristics of species that allow them to live successfully in their environment.
a) adaptations
b) abiotic factors
c) biotic factors
d) limiting factors

The living parts of an ecosystem.
a) adaptations
b) biotic factors
c) limiting factors
d) abiotic factors

All the different populations that live together in an area.
a) community
b) population
c) species
d) ecosystem

A symbiotic relationship in which one species benefits and the other species is neither helped nor harmed.
a) commensalism
b) mutualism
c) parasitism
d) predation

Environmental conditions that prevent populations from increasing.
a) abiotic factors
b) biotic factors
c) limiting factors
d) adaptations

A group of organisms that are physically similar and can reproduce with each other to produce fertile offspring.
a) community
b) population
c) species
d) ecosystem

The community of organisms that live in an area, along with their nonliving surroundings.
a) community
b) population
c) species
d) ecosystem

The nonliving parts of an ecosystem.
a) abiotic factors
b) biotic factors
c) limiting factors
d) predation

A symbiotic relationship in which both species benefit.
a) commensalism
b) mutualism
c) parasitism
d) predation

The largest population that an environment can support.
a) limiting factor
b) comunity
c) carrying capacity
d) adaptation

The struggle between organisms to survive as they attempt to use the same limited resource.
a) adaptations
b) predation
c) mutualism
d) competition

All the members of one species in a particular area.
a) community
b) mutualism
c) population
d) predation

The entire beach measures 60 meters by 30 meters. Estimate the total population of sand crabs on the entire beach.
a) 60*30=1800*25=27,000 so 27,000 crabs.
b) 60*30=1800*15=45,000 so 45,000 crabs.
c) 60*30=1800*9.375=16,875 so 16,875 crabs.
d) 60*30=1800*5=9,000 so 9,000 crabs.

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