Which statements describe how the geologic timescale is organized? Select all that apply. by intervals of time equal in length over Earth's 4.6 billion year history
by major changes in ancient Earth's climate or major natural disasters
by the appearance, disappearance, or change in dominance (frequency) of particular fossil groups
by the date that fossils were discovered by paleontologists

answer; i believe the answer is (polygenic inheritance;

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.

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.