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explain the term 'global commons'

The term 'global commons' refers to resources that are shared and accessible by all, with no single governing country or power. The four notable global commons include the high seas, the atmosphere, outer-sp...
Answered by • Geography tutor
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Explain how oxygen is loaded, transported and unloaded in red blood cells

Haemoglobin is a molecule in red blood cells with a high affinity for oxygen. It consists of 4 haem groups, each of which associate with one oxygen molecule at high pO 2 , typically in the lungs. Haemoglobin...
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Solve algebraically the simultaneous equations x^2 + y^2 = 25, y – 3x = 13

Rearrange y - 3x = 13 to y = 13 + 3xSquare y to give y^2 = 169 +78x +9x^2Sub into first equation to give x^2 + 169 + 78x +9x^2 = 25Simplify to give 10x^2 + 78x + 144 = 0 Apply quadratic formula to solve for ...
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Answered by Blake H. • Maths tutor
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What's the difference between allopatric and sympatric speciation? What are some evolutionary implications of this?

For speciation to occur, a population must split into at least two isolated parts to avoid the spread of genes between them; the nature of this isolation is what defines sympatry and allopatry. In allopatric...
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Which of these fractions is the largest - 33/56 ,4/7, 9/21, 6/14

As it is not clear which is biggest, we need to make sure that the fractions are in their simplest form. For 33/56 there no common factors so this is the simplest form. 4/7 is clearly in the simplest form. 9...
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Answered by Toby S. • Maths tutor
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