Fill in the blanks using the following expressions.

1. under threat of extinction
2. deferred
3. behavioural traits
4. go further back
5. occupied in

1. The department ___ (= put off) the decision for six months.
2. You will be mainly ___ checking sales records.
3. To answer that question we need to ___ in time.
4. Many wild plants are ___.
5. We do not know which ___ are inherited and which acquired.

The answer key
1. deferred
2. occupied in
3. go further back
4. under threat of extinction
5. behavioural traits