For a long time, the fact that immigrants from eastern europe, asia, and latin america tended to be shorter than native-born americans was taken as evidence that there were inherent racial differences between these populations. however, the immigrants had children who grew up to be as tall as anyone else. geneticists now tell us that, although there can be considerable variation in height within a group due to genetics, height differences between groups are largely caused by diet. what does this demonstrate?

Mucous membranes.. a. cover or line external surface of body. b. line internal body surfaces that are in contact with the environment. c. produce antibodies to combat infection. d. secrete sweat, which has antibacterial enzymes.

You isolate an infectious substance capable of causing disease in plants, but you do not know whether the infectious agent is a bacterium, virus, viroid, or prion. you have four methods at your disposal to analyze the substance and determine the nature of the infectious agent.i. treat the substance with enzymes that destroy all nucleic acids and then determine whether the substance is still infectious.ii. microscope.iii. culture the substance on nutritive medium, away from any plant cells.iv. treat the sample with proteases that digest all proteins and then determining whether the substance is still infectious.if you already know that the infectious agent was either bacterial or viral, which method(s) listed above would allow you to distinguish between these two possibilities? a) ib) iic) ii or iiid) iv

Cross-training shoes are best for use in? a. group exercise classes b. tennis matches c. soccer games