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What is the difference between allopatric and sympatric speciation?

Allopatric speciation occurs when two species are living in separate environments and therefore there is no gene flow between the populations. This will then cause the populations to differentiate (change) b...
OL
Answered by Olivia L. • Biology tutor
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How do I properly analyse a poem?

Firstly, before approaching the poem, note down the form of the poem, including the number of stanzas, the number of lines in the stanza and the rhyme scheme (if there is one). It is then important to re-rea...
CP
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What is a nucleotide?

A nucleotide is the basic unit that makes up DNA. A singular nucleotide is made up of x3 components: A base (A, T, C or G) 5 Carbon sugar (deoxyribose = DNA or ribose = RNA) Phosphate group (forms a bond bet...
HA
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Why is the derivative of x^2 equal to 2x?

Differentiation is finding the slope of a graph; how steep it is at some point. In this case, we want to find out how steep the graph of x^2 is. To do this, we could look at the slope between two points on t...
LH
Answered by Lawrence H. • Maths tutor
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Describe the initiation and conduction of electrical signals through the heart.

For the heart to pump efficiently the control of contraction of its atrium and ventricles needs to be coordinated. Electrical signal starts at the sinoatrial (SA) node, also known as the pacemaker node. The ...
HA
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