Similar bone structure found in distinct organisms indicates that A.
they live in the same habitat
B.
they fill the same niches
C.
they share a common ancestor
D.
All of the above

C

Explanation:

The similar bone arrangement of the human, bird, and whale forelimb is a structural homology. Structural homologies indicate a shared common ancestor. ... For example, the forelimbs of whales, humans, and birds look different on the outside because they're adapted to function in different environments.

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.