Soil that is rich in humus has high
When earthworms add their wastes to the soil then die and decay in the soil they are contributing to the formation of
These organisms break down and digest the remains of dead organisms
Soil is a valuable resource because it
What tem describes the management of soil to prevent its destruction?
The practice of plowing fields along the curves of a slope is called
In which soil layer would you find loam that is rich in humus
In conservation plowing why are dead weeds and stalks of the previous year's crop left in the ground?
ponds and rivers are two types of this
The living parts of an ecosystem are called this
What would be a biotic factor in the prairie ecosystem?
The smallest unit of ecological organization is a single
Gray wolves in a forest are an example of a
The largest population that an environment can support is called
The nonliving parts of an ecosystem are called
The study of how things interact with each other and with their environment is called
All the different populations that live together in an area make up a(n)
Which biome receives less than 25 centimeters of rain per year?
Coral reef, wetlands, and estuaries are all sub categories of what biome?
Which biome is extremely cold and dry?
What do producers release as a result of photosynthesis?
What makes a leaf appear green?
The ingredients of photosynthesis are
Photosynthesis in plants produces this
to carry out photosynthesis, algae and plants use the biotic factors sunlight, carbon dioxide, and this
