Whales have what seem like remnants of a pelvis and femur, as shown here. what are these structures an example of?

They're vestigial structures (meaning they're "left over" from some ancestor species of the whale). In the whale's ancestor species, the pelvis and femur were functional; over time, as the whale started living in the ocean and they became unnecessary, the pelvis and femur shrunk into what they are now.

Reduction in overall biodiversity

The virus is considered to be are living item since they have hereditary material dnas or rnas. they can imitate and change. they respond to boosts, for example, radiation, chemicals, and warmth. they have antigenic properties. they are proficient to duplicate with a same hereditary constituent.