Question

sustainability means developing practices that protect the environment while also providing for human needs. which of the following changes would be most helpful in achieving sustainable agriculture?
clearing land for agriculture by cutting down trees instead of burning them
rotating crops to replenish the soil with nutrients
tilling the ground to remove weeds and create uniform crops
growing crops that produce only renewable resources
question 13 (multiple choice worth 4 points)
(04.02 hc)
which of the following is an example of the changes that take place in an ecosystem during secondary succession?
shrubs and trees quickly regrow in an area that has been burned during a forest fire.
organisms compete for resources, and those that are best fit to survive establish themselves as dominant species.
algae, grasses, and small plants grow on newly exposed rock over a long period of time.
predation causes a population of prey to migrate to a new location in order to survive.

Explanation:

• For the first question:
• Clearing land by cutting trees still disrupts the environment. Tilling can lead to soil erosion. Growing only crops for renewable resources is too narrow. Rotating crops replenishes soil nutrients, which is key for sustainable agriculture as it maintains soil fertility without degrading the land, thus balancing environmental protection and human food needs.
• For the second question:
• Secondary succession occurs in an area where a disturbance (like a forest fire) has happened but soil and some organisms remain. Shrubs and trees regrowing quickly in a burned area is secondary succession. Organisms competing for resources is a general ecological process. Algae, grasses on new rock is primary succession. Predation - induced migration is not succession.

Answer:

• First question: Rotating crops to replenish the soil with nutrients.
• Second question: Shrubs and trees quickly regrow in an area that has been burned during a forest fire.