Answer:
b. more than half
Explanation:
According to the U.S. Office of Management and Budget, <u>more than half</u> of the major technological advances of the 20th century originated with individual inventors and small companies. Innovation in the 20th century that originates from individuals and small companies are, the air conditioner, FM radio, insulin, helicopter, jet engine, instant camera among others. Individual and small companies were the major drivers of technological advancement in the 20th century. However, technologies such as the internet was government driven and funded.
The storage of food and water first and foremost, as both spoiled on ships of the period. Secondly, one would worry about getting lost. No GPS and no actual way to tell where you are if a wind or storm blew you slightly off course. Imagine how impossible it would be for a ship to travel in a perfectly straight line whilst traveling the entire span of the Atlantic, Pacific, or even smaller bodies of water such as the Mediterranean.
Answer: <u><em>A typical signal transduction pathway</em></u>
Explanation: This involves the binding of extracellular signaling molecules and ligands to receptors, located on the surface or inside the cell that can trigger events in the cell, to have a response. Based oh chemical reactions when the cell attaches a receptor of the cell membrane.
Answer:
While Mars' atmosphere is mostly CO2, a greenhouse gas, there isn't enough atmosphere to create an effective insulating layer to hold in the trapped IR radiation.
Explanation:
The remaining gases are a mixture of nitrogen, argon, oxygen and carbon monoxide. CO2 is a potent greenhouse gas, so Mars does have a greenhouse effect. But it's very weak because the Martian atmosphere is so thin -- 100 times less dense than the Earth's atmosphere.