Weather is an important environmental factor that affects life on earth. which one of the following human activities impacts the weather negatively?
a. respiration
b. burning of fossil fuels
c. transpiration
d. windstorms

What is the 77 element on the periodtic table

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

How many species of living things are alive on earth today? more than 1,000,000 none of these answers are correct 100-500 1,000 –500,000 o 500,000 -1,000,000