Astudent wants to know if the bubbles on this water plant are oxygen gas
(02). however, identifying a gas as o2 with direct evidence requires many
kinds of equipment.
which observation would provide indirect evidence that the bubbles are 02?
meurement of the plant's growth over time

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.

Cells destroy body cells infected by a virus or bacteria.

Why is it important to study each branch of earth science?