The half-life of a radioactive element is the time it takes for:
A) half of the radioactive atoms to double themselves.
B) half of the radioactive atoms to decay into isotopes.
C) the radioactive atoms to increase by half of its initial quantity.
D) the radioactive atoms to increase to 1.5 times of its initial quantity.
Question 2
Which of the following is true of meteors?
A) They are not stars.
B) They orbit Terrestrial planets.
C) They are composed of frozen water.
D) They do not contain rock or metal.
Life cycle of Obelia, a colonial cnidarian.
The basic unit of life - cell
In 1994 a team of German physicists created an atom of Element 110. If the atom
What element(s) is/are being oxidized?
Mercury Element
Cis-element regulatory structures in eukaryotes