Which characteristic is common to all three groups of mammals? They require little or no parental care. They develop partially or fully inside the mother’s body. They have long gestation periods. They are always endotherms.

They develop partially or fully inside the mother's body. They have long gestation periods. Which characteristic is common to all three groups of mammals? They are always endotherms.

Explanation:

They develop partially or fully inside the mother's body. They have long gestation periods. Which characteristic is common to all three groups of mammals? They are always endotherms.

Explanation:

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2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.