Dna replication is called semiconservative because
the two resulting dna molecules each have one new dna strand and one old strand from the original dna molecule.
both of the resulting dna molecules are composed of new strands of nucleotides.
no extra nucleotides are incorporated into the replicated dna molecules.
one of the two resulting dna molecules is new.

Ryan rears sheep for their wool. recently the quantity of wool that ryan gets has diminished. this is because the new sheep are not that wooly. ryan should add which nutrient to their feed so that the sheep becomes more wooly? a.cornb.ironc.cottonseedd. vitamin a

After reading the paragraph below, answer the questions that follow. researchers have created a robot that has a very thin leg that is moved by cardiac (heart) cells contracting in unison. the robot, made of a polymer similar to that used in making contact lenses, is bathed in heart cells with supporting cells, which then attach to the robot and provide movement as they contract. all of the cardiac cells working together can cause the robot leg to move in a way that individual cells could not. this is an example of a. emergent properties of cells. b. energy flow through an ecosystem. c. adaptation. d. internal environment regulation.

Based on anatomical similarities, to which modern animal is dr. digger’s creature most closely related?