Which of the following is not true concerning cover crops?
a. they prevent soil erosion
b. they can fix nitrogen in soil
c. they are sold as cash crops
d. they add organic matter to soil

The correct option is C.

Cover crops are those crops that are grown majorly for the protection and enrichment of the soil. Cover crops has the following advantages: they increase the fertility of the soil, they prevent erosion and they improve the quality of the soil. Cover crops can also be used to control agricultural pests and diseases. Cash crops are those crops that are cultivated purposely for profits. Examples are cocoa, rubber, coffee, etc. These are not cover crops.

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.