The first organisms on Earth were able to transform the carbon dioxide in the air into what essential element needed for modern life?

A. Hydrogen

B. Helium

C. Nitrogen

D. Oxygen

What are 3 steps of the scientific method storm chasers use

A health care provider (hcp) is about to remove a chest tube from a client. after the dressing is removed and the sutures have been cut, the nurse assisting the health care provider should ask the client to perform which procedure?

Which population of organisms would begin the flow of energy through a desert food web?

Why is sexual reproduction associated with meiosis?

Yawning is observed in all types of animals, including humans. it cannot be stop mid-way but has to be continued for completion. which kind of innate behavior is yawning? a) habituation b) fixed-action pattern c) imprinting

Which term describes the class of molecules that includes starch and glycogen? A. Lipids B. Carbohydrates C. Nucleic Acids D. Proteins

A 60-year-old woman has just been diagnosed with heart failure and her primary care provider is describing the concept of adaptation. which compensatory mechanisms may have masked the client's heart failure? select all that apply.

What are two possible genotypes or the offspring?

A student notices that the saucer below a coffee cup becomes warmer after coffee is poured into the cup. Energy was transferred from - the cup to the saucer by conduction. the saucer to the cup by conduction. the cup to the saucer by convection.

The macromolecule that carries that code for building our body?