Solution:
Cretinism is a human disorder which is due to the under secretion of Thyroxin hormone.

Solution:
When the diaphragm and external intercostal muscles contract, the volume of the thorax increases.

Solution:
The five-carbon sugar ring and the content of the nitrogenous base between DNA and RNA are slightly different from each other. Four different types of nitrogenous bases are found in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G). In RNA, the thymine is replaced by uracil (U).

Solution:
Secretion of hormones for calcium regulation in blood and bones is not a function of a bone.

Solution:
Dolphins are the most highly intelligent mammals.

Solution:
As a plant's reproductive part, a flower contains a stamen (male flower part) or pistil (female flower part), or both, plus accessory parts such as sepals, petals, and nectar glands. The stamen is the male reproductive organ. It consists of a pollen sac (anther) and a long supporting filament.

Solution:
Meiosis is the process which accounts for species diversity. Meiosis is termed as a specialized cell division which reduces chromosomes number by half and then creates for haploid cells.