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Respiratory surfaces must be thin (such as in alveoli which have walls that are 1 cell thick) to create a small diffusion distance for the gases to be exchanged through. They must also have a large surfac...
b - 6 = 13Add 6 to both sides of the equationb - 6 + 6 = 13 + 6Therefore:b = 19
First, you need to factorise the quadratic:x2-3x-4=0(x-4)(x+1)=0Then, set each of the brackets to equal 0 and solve for x:x-4=0 --> x = 4x+1=0 --> x=-1
sin(2x)
Similarities Doesn't conduct electricity (only when the ionic is in solid) and covalent always (no charged particles) Many dissolve in water Differences Ionic substances loose or gain and electron to beco...
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