Mitosis is a division of a single cell into two identical daughter cells. It consists of four phases: prophase, metaphase, anaphase and telophase and cytokinesis. During metaphase, sister chromatids join together in the middle of the cell, so that during anaphase they can separate from each other to the opposite sides of the cells where they will represent future "nucleus" of the daughter cells. However, is metaphase was skipped, sister chromatids would not join in the middle, and consequently, they would not separate in anaphase. One of the possible consequences is that mitosis will stop and the cell would not divide. On the other hand, it could lead to unequal distribution of chromatids, so one cell will get both copies of chromosomes and the other will lack in chromosomes, which is lethal in both situations.
The movement of the arms and legs is accomplished by the SOMATIC subdivision of the peripheral nervous system.
The peripheral nervous system is divided into two, they are autonomic nervous system and the somatic nervous system. The somatic nervous system controls the movement of arm and legs.<span />
1. Physical changes are changes affecting the form of a chemical substance, but not it’s chemical composition.
2. A usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances.
—— remember a physical change you can see the desperate piece in a mix, such as a salad. A chemical change is when you cannot, like if you mix to salad dressings together, you cannot pick them apart again.—-
3. States that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations.
4. ^^^ example after question 2.
5. Chemical - you cannot reverse the change — separate the two salad dressings — physical- you can pick pieces apart — you can remove the tomatoes from the lettuce in a salad.
6. The majority of the log has been turned to ash, therefore making most of it into a gaseous form, which is irreversible and much lighter.
7. All are chemical. Those are all changes you cannot reverse.
8. Once you burn a paper into nothing, you cannot reverse the change and make it into paper again.
9. This would still be a physical change. The pieces are only separated, but the object did not chemically change.
Hope this helped!!
