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The concept of defining sexual reproducing species based on reproductive isolation is known as the 

Where the gonads are ______, the gametes are eggs and the sex is ______.  

DNA is packaged with ______ into very thin molecules called chromosomes.

In human females, the vulva is made of three main components: the vaginal opening, ______, and labia majora and minora.

Which of the following pairs of species are thought by biologists to be most closely related to each other?  

The key difference between internal and external fertilization in animals is that

Biological determinism is the position that behavior is controlled by genes and biological attributes are governed by genes.

Males of some insects package sperm and nutritious substances in a ______ that is used by the female for fertilizing and nourishing her eggs.

A hypothesis and a theory are terms that are used interchangeably in science.

When we identify species by a Latin name made of genus and specific epithet, we are using trinomial nomenclature.