Unit D: Changes in Living Systems

8 images of some invertebrate animals such as sea anemones, coral and jellyfish that live in a marine environment

Some dung beetles use alternative reproductive tactics to increase their chances of finding a mate. Learn what this tells us about evolution and biodiversity.

Humidity is an important part of life on Earth and life in space. This backgrounder explains what humidity is, how it is measured and how it affects us both mentally and physically.

20 images of some animals such as ants and mosquitoes that have 6 legs and 3 main body parts consisting of a head, thorax and abdomen

10 images of some animals such as ants and mosquitoes that have 6 legs and 3 main body parts consisting of a head, thorax and abdomen.

When a species ends up outside of its natural zone, the consequences on other species, ecosystems and human industries can be severe. Climate change and human activities can introduce species into new zones.

4 images of some fish such as koi that live in freshwater river and lake environments and in freshwater aquariums and garden ponds

14 images of some fish such as lion fish, grouper and sharks that live in saltwater environments like oceans, saltwater lakes and aquariums

8 images of some flowerheads such as roses and water lilies whose outer petals are longer than the petals in the centre of the flower

3 images of some asymmetrical flowerheads such as an iris and an Orchis Sima or Monkey Orchid

7 images of some symmetrical flowerheads such as asters and sunflowers whose petals radiate from the centre of the flower

5 images of some flowerheads such as petunias and lilies that start as a narrow base and widen to an open shape

How do different populations adapt to their environment? Let’s explore this concept through guppy speciation.

Bees are important for agriculture. But bee populations face threats. This resource looks at Colony Collapse Disorder, herbicides & pesticides, and more.

When fertilizers from agriculture get into lakes and rivers, big problems can result for aquatic ecosystems, food chains & webs!