The image shows EKGs of a person with normal heart waves and of a person having tachycardia. Based on this image, what kind of condition is tachycardia? A.
The heart beats abnormally fast.
B.
The heart beats abnormally slow.
C.
The right atrium of the heart stops working.
D.
The left ventricle pumps less blood to the aorta.

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.

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.