Dinosaurs roamed eararth during the
a. precambrian
b. paleozoic
c. mesozoic
d. cenozoic

Which element is used in photosynthesis found in atmosphere and fixed by bacteria?

Name the following: (a) category of pathogen that causes diseases, like common cold and mumps. (b) the microorganism that requires a host to produce.

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.