Is active transport the movement of particles from a high concentration to a low concentration or the other way around?

Which if the following best describes why invertebrates isn’t considered a scientifically valid word when classifying animals

The recycling of water from the ground via runoff or transpiration through plants back into the atmosphere is known as part of the question 6 options: hydrogen cycle nitrogen cycle transpiration water cycle

Explain what is meant by a river’s load, and describe how the load is carried.