Which two of these characteristics are examples of endoskeletons?
scales in fish
bones in mammals
calcium-rich plates in echinoderms
appendages in arthropods

What type of limiting factor affects a large population more then it affects a small population

Consider the last statement in the prompt: "people take such environmental factors into account in their choices when deciding where to live." do all people have a choice as to where they live? what factor plays a key role in this decision and may therefore play a large role in determining quality of life?

As the pea seeds respire, the level of coloured liquid in the left hand part of the capillary tube rises. by referring to what is happening in the apparatus, explain why the level of liquid changes