Complete these sentences by matching the phrases below. Scientists
recreate early
conditions of the
universe using
?
the Doppler effect
The speed of
stars can be
measured using
?
cosmic microwave
background radiation.
The prevailing
idea about the
beginning of the
universe is
called:
12
particle accelerators
The heat left
over from the
beginning of the
universe is:
the Big Bang theory
Ii

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.

some scientists like gregory adcock agree with thorne's theory of regional continuity.

others, like chris stringer and ian tattersall, believe thorne's results may be contaminated or misinterpreted.