If you were to measure the distance from Earth to Saturn, would you use light-years or AU?

How can you keep track of variables in a science experiment?

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.

The response is the basis for vaccination. primary secondary tertiary none of the above