Ascientist observes an enzyme polypeptide chain arranged in spiral turns that rise upward and are held in place by hydrogen bonds. which level of structural arrangement is s/he looking at?
tertiary
quaternary
secondary

What maintain homeostasis when a persons internal body temperature is 97.5°f

What will a hypothesis become if supported by repeated expermentation

After agricultural soils are picked up and carried by a river, how are they deposited in the river’s del which is not a cause of desertification? a) light grazing b) contour plowing c) conversion of rangelands to crop lands d) high population density