Onion leaves are green. Students testing onion leaves for the presence of starch used the method shown in the four stages of Fig 20.1 Explain the reasons for the details shown in each stage.
reasons for stage 1 .
reasons for stage 2 .
reasons for stage 3 .
reasons for stage 4 .

Which statement best explains how cellular respiration maintain homeostasis in animals? it maintains body temperature by absorbing energy. it breaks glucose into energy required by the organism. it speeds up metabolism by making oxygen. it produces energy from hormones present in the organism.

The picture shows a fishing technique called trawling. how might trawling affect marine biodiversity

What pattern of migration do whales follow?