1. Almost 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium.
2. The four most abundant elements in the human body – hydrogen, oxygen, carbon and nitrogen – account for more than 99 per cent of the atoms inside you.
Answer:
The invention of the marine chronometer by John Harrison in the middle of the 18th century made true ocean navigation possible. (1) Marine Chronometer In the early 18 th century, knowing your whereabouts on the face of the globe was difficult. As the world’s greatest global power, Britain was extremely keen to remedy that.
Answer:
it involves a physical exchange of chromosome segments in the tetrad (3)
Explanation:
def of crossing over
Crossing over is the swapping of genetic material that occurs in the germline
State the problem
Research
State the hypothesis
Test the hypothesis
Analyze the results
Conclusion
Benign means that the growth doesn’t spread to other parts of the body and the tumor is noncancerous.
