Answer:
B
Explanation:
Without the greenhouse effect the earth would be very cold.
Answer:
The Z lines and H- zone shortens during the muscle contraction.
Explanation:
Sarcomere is the area between the two Z lines. The Z- lines are present in the centre of I - band and H - zone is present in the A - band. The actin filaments which are thin filaments present in I- band and contracts, slide over the myosin filament during contraction.
The I - band, H- zones are became shortens as they are thin than the A- band. It is anisotropic band having thick myosin filaments. They are not flexible and remain in its constant shape during the muscle contraction.
After the muscle contraction, the A- band and the H- zone comes to their original shape. In other words, the sarcomere shortens and comes back during muscle contraction, and relaxation.
Answer:
19. B a force continues to be applied to the object.
20. B massive force.
21. B inertia
22. C unbalanced force.
23. C friction
24. A balanced
25. C an outside force acts on it
26. B an equal and opposite reaction
27. A No, they are traveling in different directions.
28. A No, because the direction is different
29. A force
30. D Gravity
