Answer:
The filter bed is cleaned by occasional backwashing ;-; im sorry if this isn't a great answer but I tried
Im pretty sure it would be d.
I think the answer is C. An element or compound that cannot be physically separated. Sorry if im wrong.
The correct answer is C. Executive branch agencies plan their fiscal budgets for the year. (Apex)
Deforestation- there are no more homes for some animals and insects after a forest is cut down.
desertification- when deserts get larger it destroys other ecosystems.
