Blood vessels that have thinner walls that are more likely to collapse when blood is withdrawn during a venipuncture are called veins.
Differently form arteries, veins are blood vessels with thin, less muscular walls. Veins have thinner walls because the blood pressure in them is much lower.
So, as a result of common intravenous injections (such as venipuncture), collapsed veins might occur. Veins are then temporarily blocked.
I believe B because the world has changed in many conditions over time and the other questions fall into the aspect of Environmental change in conditions
Sexual inter course is good for health. Its like exercise. It awakens the muscles and blood pumps faster. They also say the hormones released into your brain make you smarter. Intercourse can also be bad if your partner has disease. Hope this answer helps. And don't judge me
Copper and Silver are both different elements.