They're mineral ions.
Examples are calcium and iron
They can prevent diseases such as ricket (soft bones) and anaemia (not enough blood)
The question is incomplete as it lacks the apropriate group of choices to answer this, however, the group of choices are as follows:
A. The experiment creates ideas for new experiments.
B. The experiment supports the hypothesis.
C. The experiment can be repeated with the same results.
D. The experiment uses a very simple procedure.
Answer:
The correct answer is : B. The experiment supports the hypothesis.
Explanation:
Hypothesis is a possible explanation for the reason of any natural process to be occurred. Hypothesis can be proved with the help of scientific experiment and supported by the various evidences and data analyzed with scientific method.
Reliability of an experiment can be shown by the repetitive results of performed experiment that satisfies the hypothesis and its parts if it does not supports it is false hypothesis.
Thus, the correct answer is : B. The experiment supports the hypothesis.
Answer:
How the heart works
The heart is a large, muscular organ that pumps blood filled with oxygen and nutrients through the blood vessels to the body tissues. It's made up of:
4 chambers. The 2 upper chambers are the atria. They receive and collect blood. The 2 lower chambers are the ventricles. They pump blood to other parts of your body. Here is the process:
The right atrium receives blood from the body. This blood is low in oxygen. This is the blood from the veins.
The right ventricle pumps the blood from the right atrium into the lungs to pick up oxygen and remove carbon dioxide.
The left atrium receives blood from the lungs. This blood is rich in oxygen.
The left ventricle pumps the blood from the left atrium out to the body, supplying all organs with oxygen-rich blood.
4 valves. The 4 valves are the aortic, pulmonary, mitral, and tricuspid valves. They let blood flow forward and prevent the backward flow.
Blood vessels. These bring blood to the lungs, where oxygen enters the bloodstream, and then to the body:
The inferior and superior vena cava bring oxygen-poor blood from the body into the right atrium.
The pulmonary artery channels oxygen-poor blood from the right ventricle into the lungs, where oxygen enters the bloodstream.
The pulmonary veins bring oxygen-rich blood to the left atrium.
The aorta channels oxygen-rich blood to the body from the left ventricle
The correct answer is option b. They receive instructions in their DNA.
The DNA (deoxyribonucleic acid) or the genes present in the cell guides the fate of the cells during the process of cellular differentiation in the embryonic life of the multicellular organism. The signaling molecule change the genetic expression changes, by which the cells are differentiated.