All organisms, leaving out a select few have to have an even amount of chromosomes because they all sexually reproduce. Therefore when they go through Meiosis and Mitosis they need a even number to reproduce. If there was an odd number in Mitosis then one chromosome instead of 46-23 or 24-12 being evenly split would have to end up being 23-11.5 with a half which isn't possible.
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An odd number plus an odd number will be an even number. Odd number A is (even number + 1) Odd number B is (even number + 1) A + B = (even number + 1) + (even number + 1) = even number + even number + 2 Since all even numbers are divisible by 2 and 2 is divisible by 2, each part of the result is divisible by 2, so the sum as a whole is divisible by 2, which means it is an even number.
Every one of them has an even number of factors.
An even number can be divided by 2 evenly. An odd number will have a remainder of 1 when divided by 2. 56 is an even number.
Even. All numbers ending in six are even.
Every second number greater than 2 is an even number.