__ is the degree of variation of life forms within a given ecosystem, a species or an entire planet. a Biodiversity b Ecology c Etymology d None of the above

## Step 1<br />The question is asking for the term that describes the degree of variation of life forms within a given ecosystem, a species, or an entire planet. <br /><br />## Step 2<br />The term that fits this description is "Biodiversity". Biodiversity refers to the variety of life in a particular habitat or ecosystem. It includes the number of different species and the range of genetic differences within and among these species.<br /><br />## Step 3<br />The other options, "Ecology" and "Etymology", do not fit the description. "Ecology" is the study of the interactions between organisms and their environment, while "Etymology" is the study of the origin of words.