Scientists divide Earth into three main layers: the core, the mantle, and the crust. How are these three layers identified?

by their chemical composition

by their structural features

by their plate tectonics

by their physical properties

Martha's child was born with an extra chromosome resulting in down syndrome. this is an example of:martha's child was born with an extra chromosome resulting in down syndrome. this is an example of:

Do sharks move up and down or side to side?

These are physical features shared by organisms with common ancestry; they may have the same structure. What are these strucrures?

Which of these organisms are the most closely related remember the name of an organism is in the form Genus species

3 Does each of the following have any characteristics of life? Explain your answers. a) an aeroplane b) a computer c) a brick

What is the function of cilia

What is friction and what is its significance in the context of air particle movement?

Energy flow through an ecosystem is one-way because

6. Which unit is used to measure sound intensity? A decibel B watt C meter D foot

In the deep waters of the ocean, coral reefs are found in abundance. Algae live on these coral reefs, providing nutrition and producing pigments that give color to the corals. The corals offer shelter to the algae. So, they share a association.