The answer would be C. Sending the first human into space. :D
Trace elements such as iron, iodine, fluoride, copper, zinc, and molybdenum (and much more) are very important for maintaining health. We only need very small amounts. They are also reffered as microminerals, these elements are part of enzymes, hormones and cells that we need in the body. Without these small amounts of trace elements, our body starts to show symptoms of nutrition deficiency.
hope this helps!
Climate is the average, year to year conditions of weather in an area
Answer:
Where's the picture? or explanation?
Answer:
As air pressure decreases oxygen continues to account for about 21% of the gasses in the air as it does at sea level. But, there is less oxygen because there is less of all of the air's gasses
