Some patients with coronary artery disease require a heart transplantation. as an alternative, daisy is working to produce healthy heart cells from embryonic cells. from which part of an embryo would daisy derive cells that could eventually become heart cells?

The right answer is human embryonic stem cells (hESCs).

Emerging embryonic stem cells are endowed with two important capacities: that of multiplying to infinity, by simple division (self-renewal), and that of giving birth to all types. of cells of the body (pluripotency).  

These properties open up many perspectives, not only for regenerative medicine (including cardiology) but also for the study of genetic diseases and the development of treatments.

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers