The half life for the decay of carbon- is years. suppose the activity due to the radioactive decay of the carbon- in a tiny sample of an artifact made of wood from an archeological dig is measured to be . the activity in a similar-sized sample of fresh wood is measured to be . calculate the age of the artifact. round your answer to significant digits.

Which type of organism is missing from the food web seen in the illustration? primary consumers decomposers primary producers secondary consumers

Which organelle breaks down sugar molecules that supply energy to the cell ?

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.