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How do fish ventilate their gills?

Unlike mammals fish have water as their gas exchange medium instead of air. Fish use gills for gas exchange, gills are specialised flaps of tissue which have the following features to allow efficient gas exc...
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Answered by Meg H. • Biology tutor
9279 Views

Line Q goes through (0,5) and (4,7). Find the equation of Line Q in the form y = mx + c

M = Gradient M = (y 2 - y1)/(x2 - x 1 ) C = the 'y' intercept, where x = 0 Therefore, M = 2/4 = 1/2 = 0.5 y = 0.5x + 5
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Answered by Tutor105540 D. • Maths tutor
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PQRS is a parallelogram with P->Q=a and P->S=b. Find S->Q in terms of a and b. N is a point between S and Q, where SN:NQ is 3:2, find N->R

Vectors are special in that they have a direction as well as magnitude (size). To get from S->Q you can go from S->P = -b and then P->Q = a so S->Q = - b + a = a - b (remember underlining) To fin...
KB
Answered by Kristian B. • Maths tutor
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What are the main differences between mitosis and meiosis?

Mitosis Human cells have 23 pairs of chromosomes (diploid - 2 copies of each chromosomes). This is a form of cell devision which makes an exact replica of the cell that is dividing. The cell grows and the DN...
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Answered by Jun Yu C. • Biology tutor
5036 Views

Explain the cardiac cycle

basic anatomy of the heart: chambers, valves, structural difference between right and left side of the heart pulmonary vs. systemic circulation blood flow through the heart
UT
Answered by Umamah T. • Biology tutor
3037 Views