What is one major difference between sandstone and siltstone? a.) particle size b.) calcium carbonate content c.) method of formation d.) amount of organic material

Dna is the genetic material that makes up living things, and folic acid plays an important role in the information of dna. jon wants to study the effect of folic acid on dna formation in microbes. which statement accurately describes the variables in this study

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.

1. describe the structure and function of the specialized cells you observed in the video. 2. research the types of cells present in the kidney.