In economics, a trade off is best decribed as A. the study of people producing and exchanging ideas
B. exchanging goods for services
C. giving up some of one thing to have more of some other thing

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

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form

What molecules does hemoglobin decay into over time