PLEASE HELP ME, I REALLY NEED THIS ANSWERS NOW WORTH 130 1.) You work for the Minnesota DNR and are doing research on the pH tolerance of invasive species found in Minnesota lakes. Below are the results you found. Which species has the best / highest tolerance to pH changes?

- Zebra mussel (6.5 – 9.0)

- Eurasian water milfoil (5.4 – 11.0)

- Curly leaf pondweed (6.6 – 9.9)

- Silver Carp (5.5 – 9.0)

2.) What type of element is present in a supernova gas cloud that is not present in a smaller star like our sun?

Hydrogen

B)Gold

C)Helium

D) Carbon

3.) An average tree can absorb about 48 pounds of carbon dioxide from the atmosphere each year. If this tree is cut down, what happens?

A) 48 pounds of carbon dioxide is added to the atmosphere per year. Atmospheric oxygen levels decrease.

B) 48 pounds of carbon dioxide is taken out of the atmosphere per year. Atmospheric oxygen levels decrease.

C) 48 pounds of carbon dioxide is added to the atmosphere per year. Atmospheric oxygen levels increase.

D) 48 pounds of carbon dioxide is taken out of the atmosphere per year. Atmospheric oxygen levels increase.