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thin diffusion distance- 1 cell thick 2. large surface area- alveoli 3. large concentration gradient- lots of blood vessels 4. moist

Vol = 1/3 pi r^2 h r = 2n h = 3n Therefore Vol = 1/3.pi.(2n)^2.3n Vol = 1/3.pi.12n^3 Vol = 4.pi.n^3

The enhanced greenhouse effect is the stronger impact caused by human emissions of greenhouse gases. Greenhouse gases include carbon dioxide, methane and water vapour and are often produced by burning fossil...

When confronted with an historical source, there are a few easy steps you can take to immediately assess how reliable it is. First of all, you need to decide whether the source is primary or secondary. A pri...

It depends on the verb - does it end in an 'er', 're', or 'ir'? With regular verbs, you simply take the stem (the part without the aforementioned ending) and then for 'er' verbs, add 'e', 'es', 'e', 'ons', '...