The pulmonary veins carry oxygen-rich blood between the lungs and the heart.
It is actually the only vein in the boy that carries oxygenated blood. A clue to answering questions about veins is that veins are blood vessels that carry blood towards the heart while arteries carry blood away from the heart.
Placebo-controlled<span> studies is one of the ways testing a medical research in which, in addition to a </span>group<span> of subjects that receives the treatment to be evaluated, a separate </span>control group<span> receives a sham "</span>placebo<span>" treatment which is specifically designed to have no real effect. So, the answer for this question is letter D. Those placebo doses are for used as a control group in an experiment.</span>
The euglena will lose its flexibility
Answer:
With monoculture crops, it messes up the natural balance meaning genetic diversity is lower.
Explanation:
Photosynthesis makes the glucose that is used in cellular respiration to make ATP. The glucose is then turned back into carbon dioxide, which is used in photosynthesis. While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.