Which perspective on conceptual change suggests that knowledge is organised as a complex system of meaning? Because concepts do not change easily, teachers should:

Here are the answers to your questions:

1.1.9 Which perspective on conceptual change suggests that knowledge is organised as a complex system of meaning?
The perspective that views knowledge as a complex, interconnected system, similar to scientific theories, is the "Knowledge-as-Theory" perspective. This view suggests that learners' existing ideas are coherent and structured, making them resistant to simple replacement.

The correct option is:
d. Knowledge-as-Theory
$\boxed{\text{d}}$

1.1.10 Because concepts do not change easily, teachers should:
Since learners' existing concepts are often deeply held and resistant to change, effective teaching requires a sustained approach. Teachers should design instruction that allows for a gradual restructuring of these concepts over time, rather than expecting immediate change.

The correct option is:
c. Structure multiple lessons that allow for gradual change
$\boxed{\text{c}}$