Which of These Would a Palaeontologist Most Likely Do to Determine

question 31

Multiple Choice

Which of these would a palaeontologist most likely do to determine if a fossil represents a reptile or a mammal?

• A) Look for the presence of milk-producing glands.
• B) Look for the mammalian characteristics of a four-chambered heart and a diaphragm.
• C) Use molecular analysis to look for the protein keratin.
• D) Examine the teeth.

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Definitions:

Androgens

Male sex hormones, such as testosterone, that are present in both males and females but usually at higher levels in males, affecting physical development and sexual features.

Testosterone

A steroid hormone that plays a key role in the development of male reproductive tissues, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.

Estrogens

A group of steroid hormones that promote the development and maintenance of female characteristics of the body.

23rd Chromosome

One of the pair of chromosomes responsible for determining the sex of an individual, with XX typically denoting female and XY typically denoting male.