The diagram below represents some steps in a procedure used in the field of biotechnology. Enzymes
)
+
Gene for
human
insulin
Cut
bacterial
DNA
Inserted into
bacterial cell
Bacterial cell
This bacterial cell can now be used to produce
1. the bacterial gene for insulin that can be inserted into humans
2. human genes for enzymes that can be inserted into humans
3. insulin that can be used by humans
4. enzymes necessary to treat human diseases

Is snow a type of precipitation? explain why or why not.

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.

The smallest parts of these that retain their original properties are called