Top answers

How do new species evolve?

Allopatric speciation: New species appear when one interbreeding population is split into two reproductively isolated populations, which then evolve to become separate species. This mostly happens when popul...
GF
Answered by Gyda F. • Biology tutor
9715 Views

What is the difference between a composite (cone) volcano and a shield volcano?

Composite cone volcanoes are made out of alternate layers of magma and ash deposits whereas shiled volcanoes consist mainly of magma deposits only. composite cone volcanoes are also steeper sided whereas shi...
BR
Answered by Bethany R. • Geography tutor
6303 Views

What is the gradient of the function f(x) = 2x^2 + 3x - 7 at the point where x = -2?

To work out the gradient of a function f(x), we need to differentiate it with respect to x, to give us f'(x). If x = a at a point, then the gradient of f(x) at that point is f'(a) (substitute a in place of x...
JJ
Answered by Jake J. • Maths tutor
12373 Views

If n is an integer such that n>1 and f(x)=(sin(n*x))^n, what is f'(x)?

Let us denote sin(nx) = u(x), where u is a function of x. The equation is now therefore f(x) =(u(x))^n. For simplicity, we will write that as f(x) = u^n By the chain rule, we know that f'(x) = df/dx = (df/du...
NT
Answered by Noam T. • Maths tutor
5198 Views

If hydrogen was burnt in a chamber full of oxygen, what would be the effect on the chamber pressure and why?

The equation for the reaction is; 2H 2 +O 2 = 2H 2 O From the equation it can be seen that 2 moles of hydrogen reacts with 1 mole of oxygen to produce 2 moles of water vapour. Since the reaction used more mo...
FO
3756 Views