Influential nineteenth-century scientists like charles darwin concluded that the complex adaptations we see in plants and animals are problematic and require a special explanation because

a. a divine creator designed them.
b. it is very unlikely that they arose by random chance alone.
c. they occur in most plants and animals.
d. they have no real function.

c)

Explanation:

They observed that almost every specie they encountered was equipped with things that would give them an advantage in the settings they found themselves in. 'Natural selection' was the term used by Charles Darwin to explain such observations. He explained that species developed variations as a result of their encounter with the external environment. Those with variations that gave them best evolutionary advantage survived as a result and those without them lost the battle for survival. This is how essential traits are preserved in species.

gametes or germ cells are haploid cells (example: sperm and ova) containing only one set (or n) number of chromosomes and autosomal or somatic cells are diploid cells containing 2n number of chromosomes.

the answer is b: 1.4 km/hr