What is oestrus cycle

It is the recurring reproductive cycle in many female mammals, including estrus, ovulation, and changes in the uterine lining.

Explanation:

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in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

a metamorphic rock would be formed.