This one can be tricky, because your are changing the appearance of the substance. But here, you aren't changing its chemical form, so its a physical change. Even though you can't bring the pencil to its original beginning, its still a physical change.
Answer: Physical change.
Answer:
they have cell walls as an outer boundry
Explanation:
the cells of all living things do not have cell wall. animal cells do not have cell wall. protozoans also do not have cell wall. while cells of plants algae fungi and bacteria have cell wall.
Like repels like when we're working with electrical charges. So positive repels positive and negative repels negative. When you have questions that ask which of the following or which of these or something like that, it's best to give us those options so we can give you the best help possible.
While both carbohydrates and lipids are made up of carbon, hydrogen and oxygen there are several differences:
1. Carbohydrates are chains of 2 or more carbon atoms. These can be very lengthy (like long cellulose chains of glucose units). They have many polar OH groups (e.g. glucose - C6H6O6). Most carbohydrates are hydrophilic and are soluble in water because of their polar OH groups. They are not necessarily sugars nor are they necessarily sweet. They are also important components of DNA, RNA and ATP.
2. Lipids are more diverse in their chemistry. They generally have a polar region at one end (this end attracts water) and a large non polar hydrocarbon region that repels water. Lipids don't dissolve in water and instead clump together with their hydrocarbon regions on the interior. Lipids include oils, fatty acids, waxes, steroids and hormones.
