Identify which of the following gases is most abundant in Earth’s atmosphere today. a. Argon b. nitrogen c. oxygen d. carbon dioxide

In a good thermo flask the main cause of heat loss is

Give me a example of a decomposer. explain what would happen if decomposers were absent from a forest ecosystem

The radioactive isotope of lead, pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.3 hours. if 1 gram of this isotope is present initially, how long will it take for 80% of the lead to decay? (round your answer to two decimal places.)