A bar of gold is melted into liquid. The liquid is then poured into a mold to make pieces of jewelry. is this process a chemical change or physical change

Explain why phospholipid molecules form a bilayer. (3 marks)

In 1992, hurricane andrew left a wake of destruction through florida. one victim of the storm was a reptile-breeding facility. over 900 burmese pythons were set free, and today thousands of pythons live in florida. these pythons are an invasive species, or a harmful species not native to the region. 1. what impacts do you think the burmese pythons might have on local ecosystems

What is the ecological role of food chains and food webs