Scientists are using carbon-14 to date a fossil found in some ruins in a crater in southern arizona. using a particle accelerator, it is determined that a sample from the fossil contains 25 g of carbon-14 and 75 g of nitrogen-14. using this information, what is the most likely age of the fossil?

This is a coral reef ecosystem. many biotic and abiotic factors affect the health of this ecosystem. which set correctly pairs a biotic factor and an abiotic factor?

The serengeti plains are part of the african savanna ecosystem and are home to a variety of different species of plants and animals. the serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce. which type of limiting factors does the seasonal drought in the serengeti plains affect?

Which of the following molecules can be broken down into simple sugars? a. nucleic acid b. protein c. lipid d. carbohydrate