Skeletal tissue which makes up the skeletal system.
Answer:
4600-4500 million years ago, the Earth formed and its crust cooled to become solid. 4500-4400 million years ago, the oldest known thing to have formed on Earth, zircon, formed along with solid crust and oceans. 4200-4100 million years ago, the close of the Hadean Period (there are no surviving rocks).
Answer:
C
Explanation:
<em>The correct answer would be the group that was given a placebo.</em>
A control group in an experimental study is the group that is subjected to all other conditions except the variable whose effects are being determined during the course of the experiment.
<u>Since the main goal of the research is to evaluate the effectiveness of the HPV vaccine, the difference between the experimental and the control group would be the vaccine.</u> Instead, the control group would be given a placebo - a substance that is designed not to have any effect but looks like the vaccine itself.
<em>Correct option: </em><em>C</em>
Answer:
Mosquitos, roundworms and ticks.
Explanation:
Answer:
D
Explanation:
The neuroendocrine system is made up of the cell in the body that ‘sit’ between the nervous system and the endocrine system. These cells are like the pituitary gland, islets cells of the pancreas, thyroids, and etcetera. They receive nerve impulses from nerves connected to them. The impulse then triggers them to release respective hormones into the blood.
