In my class, my teacher asks about the colour of solutions after reactions and I never seem to understand from where my classmates know the answers. Is there some rule which I can follow, or is it something I just have to learn them from the internet?

Someone, part 1: which compound does c represent? part 2: name a process that could release this compound into the air. part 3: explain how the elements that form it are conserved during the carbon cycle. use complete sentences to explain your answer. justify how this compound was created from a recycling of carbon in the carbon cycle. use complete sentences to explain your answer.

The chemical bond connecting one nucleotide with the next one along the nucleic acid chain is called a

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?