What’s the difference between a primary source and a secondary source? A primary source was written by someone who actually experienced the event. The difference is about where the source appears—online or in print. Primary sources are shorter than secondary sources. The difference is about how closely the source re

Hello there,before the 1940s, scientists believed that proteins, rather than dna, were the carriers of genetic material in the cell. why?   answer:   proteins are present within the nucleus

The answer is a, crossing over

Answer mass is conserved in living systems through the processes of photosynthesis, cellular respiration, and the carbon cycle,; ; ; also, energy is transferred as matter is transformed from one chemical to another, matter is oxidized to carbon dioxide and water during respiration . energy is transferred as matter is broken down into simpler molecules and some energy is converted and released as heat;