Which structural characteristic is seen in RNA but not in DNA?
o double strands
o a single strand
O chains of nucleotides
O a helical shape

The seed coat's most important function is to provide a) a nonstressful environment for the megasporangium. b) the means for dispersal. c) dormancy. d) a nutrient supply for the embryo. e) desiccation resistance.

Aboy with an extra x chromosome probably has which of the following syndromes?

Aristotle classified animals according to their a. habitat and mating behavior c. mating behavior and relatedness b. habitat and physical differences d. physical differences and mating behavior