Clinical signs are usually seen 3-5 days after exposure. Second-generation coumarins and indandiones are toxic with a single dose. Second-generation coumarins are a greater hazard than first-generation coumarins if the dog or cat eats a poisoned rat or mouse.
Quick Answer. Fractions were created by the ancient Egyptians in 1800 B.C. Egyptians created a number system on a base 10 concept, which is similar to the numerical systems used in the United States and around the world for creating fractions. Originally, Egyptians used pictures as well as numerals to display and differentiate numbers.
Fractions are not even numbers or odd numbers, because they are not whole numbers. They are only parts of numbers, and can be written in different ways. For example, you can't say that the fraction 1/3 is odd because the denominator is an odd number.You could just as well write that same fraction as 2/6, in which the denominator is an even number. The terms âeven numberâ and âodd numberâ are only used for whole numbers and their opposites (additive inverses).or example, you can't say that the fraction 1/3 is odd because the denominator is an odd number. You could just as well write that same fraction as 2/6, in which the denominator is an even number. The terms âeven numberâ and âodd numberâ are only used for whole numbers and their opposites (additive inverses).