Ostriches go through a large change in body mass as they grow from hatchlings to adults. Body mass increases 25-fold as the bird develops from a four-week hatchling to a full grown adult. The duration of a reflex loop (time from stimulus to response) depends on the distance (length) the signals have to travel and the conduction velocity of action potentials along axons. If the conduction velocity is directly proportional to the cross-sectional area of axons(A) by what factor does the cross sectional area of the axon have to increase in order to maintain a constant reflex duration as the animal grows?(B) By what factor would the cross-sectional area of axons increase under isometric scaling.

your answer is c! hope this : )

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.