The answer should be testable
Answer:
D. A mutation causing uncontrolled cell division
Explanation:
Cell division is controlled by various mechanisms. Any mutations in the genes regulating the cell division lead to uncontrolled cell division. Loss of control over the process of cell division leads to the formation of tumors.
These tumors may cause cancer if they are transformed into malignant tumors. Hence, a mutation that causes loss of control over cell division is harmful.
Antibodies are produced when the body is exposed to a pathogen. Antibody production is a function of the specific immunity arm of the immune system.
During the first encounter with a pathogen, antibody production against that pathogen is a bit slow and not very vigorous. However, memory of that pathogen is kept in memory cell which are a type of lymphocyte.
On a second encounter with the same type of pathogen, the immune system specifically remembers the pathogen and the response this time round is faster, very vigorous, specific and very effective.
Vaccines follow this principle, making good use of immune memory.
The answer is C. Because they do have scales
Answer:
1. lactic acid, 2. varicose veins or spider veins, 3. posture, 4. muscle fibers, 5. range of motion, 6. muscle myofibrils
Explanation:
1. usually happens during anaerobic metabolism reactions, there is sufficient O₂ to decompose the glucose and glycogen formed during exercise.
2. these veins are common in older women and usually are formed as a result of standing for too long. The semi-lunar valves weaken in the leg, and therefore blood does not get caught in those valves but escapes downwards and then collects resulting in those thick or swollen looking veins, or it is hereditary.
3. this is the manner in which you keep your body and its muscles in place or basically how one 'carries their body.'
4. the human skeletal muscle is made of these muscle fibres which add density and support to the bones along with the veins and nerves
5. this is the specified amount of movement a body is able to do, each individual has a different range of motion, the older one gets, the less of a range there is present.
6. is kind of a 'monomer' for muscles, it is the 'basic unit' and is rod shaped. Each rod has thick and thin filaments within them.