Answer:seventy-seven thousand years ago, a craftsman sat in a cave in a limestone cliff overlooking the rocky coast of what is now the Indian Ocean. It was a beautiful spot, a workshop with a glorious natural picture window, cooled by a sea breeze in summer, warmed by a small fire in winter. The sandy cliff top above was covered with a white-flowering shrub that one distant day would be known as blombos and give this place the name Blombos Cave.
Explanation:
Answer:
Sickle cell anemia
Explanation:
Sickle cell anemia is caused by a genetic mutation that results in the production of abnormal hemoglobin. Under low-oxygen conditions, the abnormal beta chains link together and form stiff rods that alter the shape of the RBCs.
<h2>Intercostal Muscle</h2>
Explanation:
Very young children tend to breathe predominantly with their diaphragm because:
c. their intercostal muscles are not fully developed.
Intercostal muscle are located between the ribs and helps in the movement with of the chest. These help in increasing the volume of the chest and are mainly associated with the breathing. Young childrens do not have very well developed intercostal muscle and so they use their diaphragm to breathe.
The nucleic acid is DNA. If you change the thymine with uracil, it would have been RNA.
