Question

such as fur color or beak size.

1. scientists use ____________ to read the genetic code of organisms and understand

which genes control specific traits.

Explanation:

In the field of Biology (a subfield of Natural Science), techniques like genetic engineering or molecular biology methods (such as DNA sequencing) are used to read the genetic code and determine trait - controlling genes. The most appropriate term here is "genetic engineering" or more specifically "DNA sequencing" - related methods, but in the context of basic biology education, "genetic engineering" or "molecular biology techniques" are relevant. However, the key concept here is related to studying genes and their relation to traits, which falls under Biology.

Answer:

genetic engineering (or DNA sequencing - related methods, but in basic biology context, "genetic engineering" is a common answer for this type of fill - in - the - blank related to reading genetic code and understanding gene - trait relationships)