Cara and chuck were looking at pond water through a microscope. they saw this image. cara wondered what it was. chuck said it had to be a living thing because it was

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

The picture represents a structure of the respiratory system. which is the function of this structure? to bring air into the body to exchange oxygen with carbon dioxide to carry air to the lungs to release oxygen from the body

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca