60 years is three half life for the substance, so 40*1/2^3=5
Cellular respiration is the process of oxidizing food molecules, like glucose, to carbon dioxide and water.
hope this helped ^^
Explanation:
Observations allow us to collect data that we can connect back to the central problem. From this data we can start to form hypotheses (predictions on possible solutions or outcomes).
Answer: North America
Explanation: About 80 million years ago, North America and Europe, Australia and Antarctica, and India and Madagascar followed suit and separated. Over millions more years, the continents moved to their approximate current positions.
