Hassles are correlated with increased short-term illnesses such as colds, backaches, and headaches.

This is a true statement.

Explanation:

If we think about our day to day life we will observe that major problems which can be termed as big are very few and come rarely, like big diseases, accidents, environmental calamities etc.

However what troubles us most in day to day life are small things like dispute initiating arguments, delays, small disagreements, frustrations, annoyance etc, the things that are commonly referred to as Hassles.

A study was made where 261 patients having headaches, colds, backaches and such short-term illnesses were observed for the cause behind these problems. The researchers found that most of the patients were suffering from no other cause than daily hassles which were seriously effecting their day to day life in form of all time minor health problems. Therefore, it seems important to minimize the unnecessary hassles in everyday life through suitable psychological counselling as well as techniques like yoga and meditation to improve health.

Hope it help!

the answer is:

carbon dioxide

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!