Which of steno’s principles is responsible for the thin undisturbed layers found in the grand canyon? a. principle of superposition b. principle of original horizontality c. principle of original lateral continuity d. principle of faunal succession

Which of the following is a cause of a dna mutation? o a. the linking of amino acid subunits into a long chain o b. the transcription of dna into rna o c. an error in the repair of damaged dna d. the diffusion of molecules across the cell membrane submit

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water

What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b.diffusion c. endocytosis d. exocytosisc. endocytosis