Help w/science questions?

Question

Ok #1) If you could travel to a plan with an atmosphere like that of early Earth,would you be able to survive? Explain.
I know you cant I'm pretty sure but I dont know what to explain.











Disease/viruses and stuff
1)list four ways that infectious diseases can be spread.
2)what is an antibiotic?what types of infectious diseases do an antibiotic cure?
3.What is a vaccine?
4.Why is washing your hands an effective way to precent the spread of some infectious diseases?

Answer 1

You could not survive because there was only a trace amount of oxygen in the atmosphere until about 2 billion years ago. There was a lot of methane and sulphur etc. from volcanic vents.
See Miller-Urey experiments for more info, they duplicated an approximation of the atmosphere to show that organic molecules could form from inorganic material in this atmosphere.

Transmission of disease:
By air, as droplets in sneezes etc.
By touch - dirty hands carry bacteria and disease.
By ingestion (drinking contaminated water or food).
By exchange of body fluid (kissing, having unprotected sex).

Antibiotics are used to kill certain bacteria which cause disease. They are generally derived from other organisms such as fungi, which have a natural resistance to bacteria. Antibiotics are used to cure bacterial infections such as s0ome types of tonsillitis, blood poisoning, many sexually transmitted diseases. They are no use when you have a cold, as these are generally caused by a virus.

Vaccines are used to fight diseases caused by viruses. They are generally made from dead viruses, which are used to alert the memory cells in your blood (lymphocytes), so that when you actually catch the disease, it can be effectively wiped out within hours, rather than days or weeks, during which time you can get very sick. Look up SmallPox as a good example of vaccination. Some common diseases for which there is vaccination are Measles, Mumps and Chicken Pox.

Washing you hands stops transmission of infection by touch, and then ingestion, or if you rub your eyes etc. Just as important as washing is drying your hands. Wet hands carry 1000 times as many bacteria as dry hands.

Answer 2

A1. You can simplest hypothesize that the fossil located is among the a long time of better than 275 and no more than 450 million years. You would then estimate a better age relying if the fossil used to be within the best or minimize component of the rock layer. A2. The expertise provided evidently suggests that both sea phases have risen, or that the bottom degree has fallen over geological time intervals. A 3rd probability is that a glacier transported the fossil and deposited it while melting. Eg The earth has had a number of ice a long time and for the period of such occasions the ocean degree is low. During hotter intervals the ice melts and sea phases upward thrust once more. The different probability is that tectonic plate pastime has precipitated the land to drop down.