How Many Seconds Have Elapsed Since the Family Hominidae (Including

question 46

Short Answer

How many seconds have elapsed since the family Hominidae (including the great apes)first appeared on Earth,20 million years ago? Express your answer in standard scientific notation.(Hint: There are 31.6 million seconds per year.)

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Definitions:

Held Together

A phrase indicating how parts are united or combined to form a whole.

Organelle

A specialized subunit within a cell that has a specific function, such as mitochondria, ribosomes, or the nucleus.

Ribosome

A cell organelle composed of RNA and protein, responsible for synthesizing proteins by translating messenger RNA.

Plasma Membrane

A bi-lipid layer structure that surrounds a cell, providing it protection and determining what substances can enter or leave the cell.