COPD, gum disease, fatigue, and heart attacks are all possible effects of which substance?

plaque

Explanation:

you can have plaque around your heart, and in your gums as well.

tobacco

Explanation:

Smoking is terrible for your teeth. You can get cavities, abscesses, overgrown gums, and tooth loss. Nicotine is a heavy stimulant, so without it you can get insomnia and feel awful without it, if you're a very regular smoker. Smoking is terrible for your lungs, and the body works as a system, if your lungs start failing, you can most definitely get a heart attack.

You can definitely get COPD from smoking. Smoking is terrible for your lungs, because of all the toxins that get released into your body. It can ruin your immune system, weaken your airways and most definitely kill you.

600 grams is the answer

the illustration   that would give a reader a clear understanding of the text is a picture of men constructing the frame of a building.the frame is made of iron bars. the text describes the job of blacksmiths'. these were very organised and they had different names: "the driver" and "the heater". the text describes the way in which these men worked ; they worked iron pieces as if they were playing a sport. in fact, the text wants to show the men's skills. the text also puts some emphasis on the use of '' rivets'' in construction. this kind of nails were not always used in the construction of manhattan.

some examples:

"and with an underhand toss he hurled the smoking rivet straight at the catcher, who caught it in mid-air in his catching can." men's skills

"when the driver was ready for a new " the emphasis on the rivet ( special nail used in construction).

" it against a beam to remove any cinders, and jammed it into the waiting hole. " the emphasis on the rivet.