Scientists wanted to cultivate fish in a closed system. what features should be included to ensure a closed system?
a.) allow incoming water from groundwater wells
b.) allow only one species of fish
c.) prevent precipitation from entering the tanks
d.) remove solid wastes produced from the fish in the tanks

Choose one animal (cheetas) and research on the internet what has contributed to this animal becoming "endangered" or "threatened." what animal you have chosen? how long has the animal been endangered or threatened? what has contributed to this animal’s endangered or threatened status? why is it important to save this animal from extinction? after researching and gathering facts, write a 350-word letter from the point of view of an animal rights' activist. be sure to include at least five facts that you learned from your research.

One of the purposes of transcription is to produce a sequence of bases that

Describe the function of the endomembrane system? what organelles are involved?