What is the definition of exon in biology?

Cells must be in osmotic equilibrium with their surroundings environments because if they swell or shrink thier membranes will rupture

Which of the following is true for a prokaryote? it is one of the first life forms to appear. it has all membrane-bound organelles. it must be a multicellular organism. it evolved from eukaryotes.

Anew organism has been discovered. this organism has a bilaterally symmetric unsegmented body. it's capable of moving on its own with a muscular appendage and is encased in a large shell that seems to be attached to its body. based on this evidence, which phylum would this new animal likely be classified into? a. arthropoda b. echinodermata c. nematoda d. mollusca