I would say C or D
Hope This Helps
Answer: compost
Explanation:
i looked it up and i'm pretty sure it's compost
The quicker the regulation, the less energy and material wasted to unneeded products and pathways.
Because if we're simultaneously moving/manipulating two different variables it can be very hard to determine why one variable is changing and why the other is changing. While this can be done with more complicated experimental designs, it usually is the case that scientists will only manipulate one variable and not two different ones.
