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which kind of organism obtains energy only from producers?
group of answer choices
herbivores
all of the above
decomposers
omnivores
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which of the following best describes a population?
group of answer choices
all the red birds in an area
all members of the same species
members of the same species living in the same place at the same time
all types of organisms living in the same place
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which of the following describes soil and temperature in an ecosystem?
group of answer choices
unnecessary factors
biotic factors
abiotic factors
selection factors
question
a forest fire wipes out all of the plant life in an area, causing the animals to leave. the ground becomes a mixture of soil and ashes. which order of succession is most likely to occur in the area?
group of answer choices
grasses → shrubs → softwood trees → hardwood trees
hardwood trees → shrubs → softwood trees → mosses
softwood trees → shrubs → mosses → lichens
bare rock → grasses → shrubs → hardwood trees
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after a town is abandoned, the concrete parking lots remain empty and inactive for hundreds of years. what is the most likely order of ecological succession in that area?
group of answer choices
lichens → grass → shrubs → trees
shrubs → grass → trees → lichens
grass → trees → lichens → moss
lichens → grass → trees → shrubs
question
the graphs show the trends in biodiversity of land-based life and marine-based life.
group of answer choices
biodiversity is stable for marine-based life but is not stable for land-based life.
the sustainability of ecosystems is increasing more in protected areas.
biodiversity is increasing in unprotected areas and decreasing in protected areas.
the sustainability of ecosystems is decreasing regardless of protected areas.
question
read the passage "easter island palm."
easter island palm
in the 1400s, the easter island palm became extinct due to overharvesting. reproduction was nearly impossible because islanders introduced rats when they first arrived. these rats ate the easter island palm seeds, preventing the easter island palm from flourishing. with the disappearance of the palm, the islanders could no longer build the boats they needed for fishing.
group of answer choices
a decrease in the temperature, leading to decreased biodiversity
an increase in the islanders' consumption of land and migratory birds, resulting in a decrease in the bird population
the loss of pollinating birds to the island, resulting in a decrease in the variety of plant life on the island
the erosion of topsoil, leading to decreased crop production
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the primary reason that the human population has grown rapidly over the past 100 years is that there has been
group of answer choices
a decrease in cancer rates due to scientific research.
an increase in food supplies and better access to clean water.
more access to light and electricity.
more access to renewable resources.
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which of the following would cause a decrease in a population's size?
group of answer choices
emigration
decreased death rate
increased natality
immigration
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decisions made by the current generation
group of answer choices
will not limit any possibilities for future generations.
should not include considerations of possibilities of future generations.
can open or limit possibilities of future generations.
should only be concerned with opening possibilities for future generations.
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in order to feed the growing population, scientists have found ways to increase the yield of a crop. what does the term yield mean?
group of answer choices
amount of food produced in an area.
amount of land needed for a crop.
amount of water used while irrigating.
amount of chemicals used on crops.
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which factor can cause secondary succession?
group of answer choices
competition
glacial melting
clear cutting
predation
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what is the role of a pioneer species in primary succession?
group of answer choices
to destroy parasites
to create shade
to provide fruit
to create the soil
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the number of rhinoceroses has decreased to near extinction. how are rhinoceroses classified under the endangered species act?
group of answer choices
extinct
pioneer
endangered
threatened
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lions live in groups called prides. lion populations would most likely fall in which category of population distribution?
group of answer choices
even
density
clumped
random