Robert Hooke saw the first cork cells in 1665. He also coined the word "cell" at the same time. During the next 150 years, scientists developed cell theory. They discovered cell organelles and described the cell as the basic unit of all life. One point of cell theory was NOT accepted until the early 1900's. That point was the cells give rise to other cells. For much of this time, many scientists still believed that cells just appeared. That idea was called spontaneous generation. People believed that living cells to develop from non-living things, like meat or soup. Why did it take over 150 years for the scientific community to accept the last point of cell theory: cells give rise to other cells?

The answer is c.
C ) Spontaneous generation was supported by religious views of the day.

Identify the main component f natural gas

What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.

The kidney filters potentially toxic substances in the blood, and thus “clears” the blood of those substances. this clearance function is dependent upon and proportional to the diffusion gradient of the substance across filtering capillaries, i.e. if the concentration of the substance is doubled, twice as much will be cleared from each ml of blood that is filtered. suppose that the body produces a constant amount of a substance x per unit of time. the kidneys eliminate substance x at a rate directly proportional to the concentration of the substance and the volume of blood cleared each minute (c): elimination = c × [x], where [x] is the steady-state concentration of substance x. imagine an individual with an initial concentration of x equal to [x]0 who develops kidney disease. her baseline clearance c0 drops to one half of the original (½c0). what is the new steady state concentration of x? (for simplicity, assume that substance x is 100% filtered by the kidney).