Identical twins are born, when
[a] two sperms fertilize two ova[b] two sperms fertilize one ovum[c] one sperm fertilize one ovum[d] one sperm fertilize one ovum. zygote cleaves into two cells that develop independently.

Depending on the organism the number of in a cell may change

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.

Anurse is caring for a client who is learning how to take care of a newly created colostomy. when observing a return demonstration of the colostomy irrigation, the nurse evaluates that more teaching is required when the client carries out what procedure?