A change in the color of a substance -- this one is indeed a chemical change. Think of iron, if iron turns reddish, it's a completely different substance.
Mass divided by volume is the correct answer
Answer: Hi!
An lactobacillus is a rod-shaped bacteria that produces lactic acid from the fermentation (the breaking down) of carbohydrates. Carbohydrates (also known as carbs) can be found in most food made with bread or dough along with some other foods with starches, like breads, pasta, noodles, etc.
Hope this helps!
2nd answer ecological succession .. don't know about the first one
