Which is the best definition of a prokaryotic cell? . a) it has a cell wall but lacks a well-defined nucleus and organelles , and its cytoplasm doesn't have much structure .. b) it contains a membrane-bound nucleus and organelles , and its organelles has specialized duties .. c) it contains a membrane-bound nucleus , a large central vacuole , a cell wall , a cell membrane , and chloroplasts

80 pts the type of cloud shown here may produce heavy rainfall. this type of cloud most likely occurs in an area of the sub-saharan that is a) often dry. b) often wet. c) very windy. d) usually cool.

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

In cattle a single gene with two alleles determines fur color the fur can be red white or roan roan fur has both red and white hair which of the following statements is true a the allele for roan fur color is dominant over red and white fur color b the allele for red fur color is dominant over white and roan fur color c the roan and white alleles are expressed independently of the other d the red and white alleles are expressed independently of each other