These 2 levels of ecological organization contain both biotic and abiotic factors? 1.)population, community
2.)organism, population
3.)community, ecosystem
4.)ecosystem, biosphere ​

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi