Top answers

Explain what is meant by counter current exchange in fish? Describe how it works and what adaptations the gills have to assist it.

Counter current exchange is the mechanism in which oxygen enters the blood in fish. Blood flows in the opposite direction to the water that flows over the fish's gills. Fish gills have gill filaments and the...
KF
Answered by Katie F. • Biology tutor
73418 Views

Fully factorise 2a^2b+6ab^2

1) Find the common factor between 2 and 6 (if there is one)... ...which is 2. 2) Find the common factor between a^2b and ab^2... ...which is ab. 3) Combine the answers in part 1 and 2; and separate that answ...
JH
Answered by James H. • Maths tutor
19342 Views

How do you calculate the total resistance of two resistors, R1 and R2, when they are in series and when they are in parallel?

When resistors are in series you may add up their resistances to find the total resistance, R Total = R1 + R2. However, when resistors are in parallel, it gets a little more complicated. You must use the equ...
JM
Answered by Jamie M. • Physics tutor
14969 Views

What are the differences between intermolecular and intramolecular forces?

Intermolecular forces are forces between separate molecules that hold the substance together. There are three main types; dipole-dipole interactions, hydrogen bonding and London dispersion forces, which are ...
JM
Answered by Jamie M. • Chemistry tutor
33119 Views

How do you complete the square?

You start off with a formula in the form y = x 2 + bx. The first step is to add the square of half of the coefficient of x: (b/2) 2 . This allows us to rearrange the formula into (x+ b/2) 2 . However, our fo...
JM
Answered by Jamie M. • Maths tutor
3313 Views