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Which of these sentences is correct? 1: El perro era negro y energético, 2: El perro fue negro y energético or 3: El perro era negra y energético.

The correct answer is number 1. Number 2 is incorrect because it uses the preterite tense, which denotes a punctual, completed action in the past rather than a continual state of being. Number 3 is incorr...

Answered by Emma M. • Spanish tutor

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Explain how the structure of an egg cell is related to its function.

The egg cell is a specialised germ cell which has a haploid number of chromosomes in order to allow restoration of diploid number (46) at the time of fertilisation.The egg cell contains lipid droplets to ...

Answered by NESRIN G. • Biology tutor

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Describe a 2 step synthesis to form pentan-1-ol from pentane.

Lesson on organic synthesis ( Unit 4 OCR A )Step 1/ Slide 1: Teach (unless told that knowledge is known, tips and pointers still can be given). Step 2/ Slide 2: Worked example (if necessary)....

Answered by • Chemistry tutor

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In terms of pressure and volume, explain the changes that take place in the chest to allow ventilation to occur.

Think through inhalation and exhalation separately and the events step-wise. Be aware of the movements of your own chest when breathing in and out.Inhalation (breathing in):The external intercost...

Answered by Alice H. • Biology tutor

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Describe the role of different structures (shown in the figure below) involved in the coordination of a reflex action and the sequence of events that occur(6 marks).

A receptor detects a stimulus and generates electrical impulses in response. Electrical signals are then conducted by a sensory neuron to the spinal cord. Neurotransmitter molecules then cross the synapse...

Answered by Laura S. • Biology tutor

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