Which of the following has a knot of nerve tissue at its head end?

a.

octopus.

b.

sponges.

c.

worms.

d.

bacteria.

A frog has experienced complete metamorphosis from a tadpole. True False

Which best describe how water moves during osmosis

What must the genotype look like for an organism to show a recessive trait?

Explain Cellular Respiration clearly.

Why are plans considered living organisms?

Coal is used to produce energy. The harmful gases produced by coal are cleaned up by a method which needs a large amount of limestone. Predict and explain the long term effect on the environment of obtaining and using limestone.

True or false two genes may not segregate independently if they are on the same chromosmoe

Blood pressure rises and falls in a pattern corresponding to the phases of the

Immune system cells enter a resting phase after undergoing mitosis. when activated-for example, by an infection-they can reenter the sequence of events in the cell cycle that leads to cell division.

How does a muti-celluar organisms organise