1. TT1 = 6.5
TT 2 = 6
TT 3 = 1.5
TT4 = 8
TT5 = 3
2. Answers by order: 4,1,2,5,3,3
3.
TT 4 (5mL pepsin & 5mL sodium bicarbonate)
TT 3(10mL of hydrochloric acid (HCl))
TT 2(10 mL of pepsin)
TT 5(5mL Pepsin & 5mL (HCI))
TT 1(10mL of water)
4. Tube 5 is the best representation for the stomach.
Answer:
Evolution occurs due to change in the characteristics of life.
Explanation:
The shared characteristics of life provide evidence for evolution. These shared characteristics are reproduction, homeostasis, heredity, growth, development and adaptation which occurs through evolution. The evolution mainly occurs due to changing environmental conditions. Some sea organisms such as whales evolve from land animals having four legs through the process of evolution. The environment of sea is responsible for the formation of gills and other body structure in order to survive in the water.
Answer:
It can, but each material has a different amount of heat it needs in order to change it’s form.
Explanation:
For example, If you heat water, it will go from the liquid stage to the gaseous stage. It will turn into vapour. So it is changing the form of said material.
This change is mainly due to the breakdown of molecules and chains which enable reactions to happen when heat is applied, since it changes those bonds between molecules.
Answer:
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
(1) The varying number of muscle fibers that contract
<span>In most muscles, the number of muscle fibers in different motor units ranges from a few to hundreds. The nervous system can thus regulate the strength of contraction in a muscle by determining how many motor units are activated at a given instant and by selecting large or small motor unties to activate. </span>
some muscles are almost always partially contracted. In such muscles, the nervous system my alternate activation among the motor units, reducing the length of time any one set of fibers is contracted. Prolonged contraction can result in muscle fatigue due to the depletion of ATP and dissipation of ion gradients required for normal electrical signals.ing.
<span>(2) varying the rate at which muscle fibers are stimulated </span>
<span>single action potential produces a twitch lasting about 100 msec or less. If a second action potential arrives before the muscle fiber has completely relaxed, the two twitches add together, resulting in greater tension. Further summation occurs as the rate of stimulation increases. When the rate is so high that the muscle fiber cannot relax at all between stimuli, the twitches fuse into one smooth, sustained contraction called tetanus.</span>
