Answer:
2.D 3.nitrogen and oxygen 4.at the poles 5. 8 minutes and 20 seconds 6.B
Explanation:
Answer:
contour farming => process of growing crops perpendicular to the direction of the land's slope.
grassed waterways =>planting grass in shallow channels.
crop rotation =>practice of growing different crops in succession in a field.
cover cropping and mulching => process of covering the soil surface around a plant with materials such as hay or leaf debris.
Answer:
double helix
Explanation:
The double helix is a description of the molecular shape of a double-stranded DNA molecule. In 1953, Francis Crick and James Watson first described the molecular structure of DNA, which they called a "double helix," in the journal Nature.