CFA 3 Review

Open Ended

What does food insecurity mean?

Food insecurity means not having access to nutritious food.

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Food insecurity

Multiple Choice

What type of organisms need nitrogen to survive?

• Only plants

• Only animals

• Both Plants and Animals

• Neither Plants nor animals

Open Ended

How can plants get nitrogen?

Open Ended

How does nitrogen get from the air to humans?

Subsidies

-We have learned about subsidies in this course twice now, once when learning about farming and once when talking about nuclear power

-This is where the government provides support to farmers or nuclear power plant owners.

Open Ended

Why does the government sometimes provide assistance to famers or nuclear power plant owners?

population change = original population + (births + immigration) -

(deaths + emigration)

Memphis had a population of 642, 807 people in 2022. They had 6,363 births, 5785 deaths, 3,021 people move in and 17436 people move out. What is the new population of Memphis?

O Horizon-The top, organic layer of soil, made up mostly of leaf litter and humus(decomposed organic matter)

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Soil Layers

A Horizon

-This layer is called topsoil

-Seeds germinate and plant roots grow in this dark-colored layer. It is made up of humus mixed with mineral particles.

Soil Layers

E Horizon

- It is made up mostly of sand and silt, having lost most of its minerals and clay as water drips through the soil (in the process of eluviation).

Soil Layers

B Horizon

-Also called the subsoil

-It contains clay and mineral deposits that it receives from layers above it when mineralized water drips from the soil above

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Soil Layers

C Horizon

-It consists of slightly broken-up bedrock.

-Plant roots do not penetrate into this layer; very little organic material is found in this layer.

Soil Layers

R Horizon

The unweathered rock (bedrock) layer that is beneath all the other layers.

Soil Layers