Carla has been working out and is trying to show her friends how much work she can do. In which of the following situations would she not be doing work? A. If she pushed a very large mass across a room. B. If she carried heavy boxes up a long flight of stairs. C. If she held a very heavy pair of weights in front of her. D. If she lifted a heavy barbell over her head and lowered it back down to the floor several times.

Option C) if she held a very heavy pair of weights in front of her

Explanation:

Work is done when force is applied over a distance. i.e Workdone = Force X Distance

However, Since Carla's applies force to hold the heavy pair of weights BUT no distance is being covered due to the static (non-moving) posture she took, no work is done at that moment in time.

Thus, option C is the answer

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.