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Outline an example of a reflex action

Stimulus - receptor - sensory neuron - (dorsal) spinal cord - (ventral) spinal cord - motor neuron - muscle/effector - response

Answered by Tunmise A. • Biology tutor

2245 Views

State the crystal structures of SiO2 and CO2 and why one has a higher melting point than the other.

SiO₂ forms a giant covalent structure while CO₂ has a simple molecular structure.In the giant covalent structure of SiO₂, strong covalent bonds hold the atoms together in...

Answered by Fabian T. • Chemistry tutor

27710 Views

Please could you explain to me when past participles must agree when using the passé composé? (NB in my experience, this was an issue for A-Level students of French too)

There are two cases when the past participle must agree in both gender and number in French. The first is when we use être as the 'auxiliary verb'. If we were to say, 'this man died', in French we would s...

Answered by Chris C. • French tutor

2015 Views

How do I generate the perfect tense in Spanish?

The perfect tense (eg. to have done something) in Spanish functions exactly as it does in English. We take the verb haber, which works like 'to have' in English and conjugate it:(yo) he(tú) has(él/ella/us...

Answered by Chris C. • Spanish tutor

1489 Views