Magine hearing on the radio that the local weather agency has declared a high pollution advisory. what are the health risks of high concentrations of air pollution and what can be done on an individual basis to prevent or reduce problems associated with air pollution? read more > >

The most effective way to provide children with safety messages is to a. not allow them to explore new environments. b. role play what not to do. c. clearly explain the correct way to do things. d. have a safety-themed day once each year.

Brad was almost hit by a speeding truck as he crossed the street. his heart began to race, and he felt extremely afraid as he jumped out of the way in just enough time to avoid the truck. a psychologist who supports the theory of emotion would claim that based on the arousal brad experienced, he appraised the situation and then labeled his racing heart as fear. a. james-lange b. cannon-bard c. schachter two-factor d. evolutionary

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.