Answer:
The answer is a. homologous structures
Explanation:
Homologous Structures:
Structures that have<u> similar anatomy or similar structure</u> but have different functions are called homologous structures.
These structures indicate shared ancestry between the animals in question. This means that the structures may be used for different functions but they are encoded by same or similar genes.
The bones in the picture perform quite different functions and they might look different from the outside but as we look closer, the bone structure and joints are similar. This shows that all of these animals evolved from a common ancestor.
Newton's first law of motion states that when there is no net external force, an object will remain at rest or travel with a constant velocity.
When an object is moving, there is a force of friction resisting the motion, and slowing it down. To maintain a constant velocity, a person must push with a force equal to that of friction, to counteract the frictional force.
Since the pushing force cancels the friction force out, there is no net external force, and so the object moves at a constant velocity
Hope I helped! xx
P.S.: Think this question is more suited to be asked under the "Physics" section
Intraspecific competition
If i'm correct. it should be Macroevolution
