What being half of a biological pair mean?

What is the prime factorization of 23 with work shown? Program to find area of circle using class in c? What did Albert Einstein love to do? Do sentences have to contain an adverb? What is 22 -11? How many 4 digit numbers can you form from the digits 1 2 3 4 5 where no digit is used twice? What are the different ways of building a Leader? Is nine halves a rational number? Is it illegal to attempt suicide? What is the trajectory of a projectile defined by? How many equal angles are in a rectangle? How do you multiple mixed fractions? What are the example of subject verb? 100 cm equals how many mm? What is the square root of - 0.50? What is 5 percent increase of 6 million? What is 250 over 300 in simplest form? How many numbers can you make from 4628? The sum of two consecutive odd numbers is 100. What is the smaller number? What is 5111 rounded?