There are so many of us you will probably have a hard time seeing just one of us. I am small but I have a big job. I make compounds that build your muscles, fight disease, transports oxygen, and speed up your metabolism. What am I?

The lineage of pea plants produced round seeds for four generations. the plants that fertilized these pea plants also produced round seeds. however, in the fifth generation, the plant produced to two plants with wrinkled seeds. can that be possible?