Urie Bronfenbrenner, the Russian-born American psychologist, developed the Ecological Systems Theory to describe the development of people in relation to their environment. The three main ideas he focused on for this theory include teaching his findings to other people, researching designs and development, and . applying his theories
hiring research assistants
donating to charities
educating children

What is the main structural difference between enveloped and nonenveloped viruses? a) enveloped viruses have their genetic material enclosed by a layer made only of protein. b) nonenveloped viruses have only a phospholipid membrane, while enveloped viruses have two membranes, the other one being a protein capsid. c) enveloped viruses have a phospholipid membrane outside their capsid, whereas nonenveloped viruses do not have a phospholipid membrane. d) both types of viruses have a capsid and phospholipid membrane; but in the nonenveloped virus the genetic material is between these two membranes, while in the enveloped virus the genetic material is inside both membranes.