Top answers

Describe the steps that occur in allopatric speciation or geographical speciation.

Before speciation occurs we have a population of individuals of the same species that can freely and successfuly mate with each other. In allopatric speciation a geographical barrier forms (a mountain range ...
AA
Answered by Arthur A. • Biology tutor
9804 Views

Why is the human heart system described as double circulatory?

The human heart system is described as double circulatory becasue is has two seperate circuits. The first carries blood between the heart and the lungs and is known as the pulmonary circuit and the second ca...
SE
Answered by Suzannah E. • Biology tutor
9712 Views

How does the potential travel between synapses?

The potential or information travels between a pre-synaptic and a post-synaptic neuron. As a reminder, for information, we intend the flow of Na+ and K+ ions between two locations. When the potential arrives...
FA
Answered by Filippo A. • Biology tutor
2929 Views

How does a neuron transmit a signal across a synapse?

When an action potential from a pre-synaptic neuron approaches a synapse, the change in membrane potential causes voltage-gated calcium ion channels to open across the pre-synaptic bulb. Due to the high diff...
SW
Answered by Scott W. • Biology tutor
4796 Views

Bacteria can develop resistance to antibiotics. Explain how this may be prevented.

The overuse and misuse of antibiotics promotes antibiotic resistance. A common misconception is that antibiotics can be used to treat colds and the flu, which are actually caused by viruses. Therefore, by re...
MT
Answered by Max T. • Biology tutor
3665 Views