Question

please help me i will mark as brainlist​

Answer 1

Red blood cells (RBCs), also referred to as red cells,[1] red blood corpuscles (in humans or other animals not having nucleus in red blood cells), haematids, erythroid cells or erythrocytes (from Greek erythros for "red" and kytos for "hollow vessel", with -cyte translated as "cell" in modern usage), are the most common type of blood cell and the vertebrate's principal means of delivering oxygen (O2) to the body tissues—via blood flow through the circulatory system.[2] RBCs take up oxygen in the lungs, or in fish the gills, and release it into tissues while squeezing through the body's capillaries.

Answer 2

1. the sum of -7/12 and 3/7 = -49/84 + 36/84 = -13/84

  the sum of 4/3 and 2/5 = 20/15 + 6/15 = 26/15

so their differnce = 26/15 - (-13/84) = 728/420 + 65/420 = 93/420

so the difference is 31/140

2. let the other number be x

so 3/7 + x = 13/84

or x = 13/84 - 3/7 = 13/84 -36/84

or, x = -23/84

hope this helps you