Which of the following is a sign of puberty? A.
intense changes in hormone balance
B.
increased height and strength
C.
development of sexual characteristics
D.
all of the above

Please select the best answer from the choices provided.

A
B
C
D

What are similarities and differences of reflection, refraction, diffraction and absorption?

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)

The total amount of energy contained in an object