Search our library of homework questions

Top answers

All subjects

All levels

How are lungs are adapted for gaseous exchange?

The alveoli are cell wall is one cell thick = short diffusion pathway. The alveoli are moist - so gasses can dissolve and move quicker. The alveoli are small and increase the surface area - diffuse quicke...

Answered by Georgia H. • Biology tutor

2157 Views

What defines a country as a superpower?

The term "superpower" has been attributed to countries which have significant influence and a powerful global presence. A "superpower" nation can be identified by the four pillars of p...

Answered by Sophie W. • Geography tutor

20577 Views

What reaction occurs when benzene is mixed with equal amounts of sulphuric and nitric acid?

Intro:This is an electrophilic substitution reaction (nitration)Nitric acid and sulphuric acid are used to create the electrophile (NO₂⁺)The electrophile then substitutes itse...

Answered by Simone S. • Chemistry tutor

1636 Views

Can we prove the existence of God?

The question of proving God's existence is central to debates surrounding a key area of the Theology syllabus - Philosophy of Religion in particular. To ‘prove’ that something exists would normally entail...

Answered by William L. • Religious Studies tutor

1291 Views

How does the human body's respiratory system enable the rapid exchange of gases between oxygen and CO2?

The blood capillaries surrounding the alveoli of the lungs provide them with a rich supply of flowing blood. This means that the oxygen depleted blood returning from the body picks up oxygen from inside t...

Answered by Shaakirah S. • Biology tutor

2040 Views