What environmental problem likely caused all of these problems?
a. smog from city areas is causing acid rain.
b. global warming causes all of these problems.
c. the groundwater has become polluted from city runoff. eliminate
d. there is a hole in the ozone layer over new york state.?

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.

If a strand of dna has 35% thymine. what is the percentage of cytosine, adenine, guanine?

Several billion years ago which gas was the least prevailant in the atmosphere