How is the mass number calculated for an element?

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

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.