Calculate the hydronium ion concentration in an aqueous solution with a ph of 9. 85 at 25°c.

What is the measure of ∠m? 81° 65° 53° 98° answer plz

Did the universe cool off or get hotter as it expanded after the 'big bang"?

Which statements are true for invasive species? 1. they always stabilize an ecosystem. 2. they’re always successful in adjusting to a new habitat. 3. they often compete with the native species for resources. 4. they have the ability to displace the native species. 5. they’re always pests.