Why do the common names of organisms—like daisy or mountain lion—often cause problems for scientists?

a. common names do not include descriptive language. b. common names are often difficult to remember. c. common names can be difficult to pronounce. d. common names can vary among places and languages.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds