The brain and spinal cord work together so the body can receive signals and react to the environment. What is the spinal cord? A) a cell B) a tissue C) an organ D) and organ system

Two of the nitrogen bases are single ring structures known as

Explain how sea ice forms

Congenital disorders of glycosylation are a growing class of rare diseases. Which organelle would be most commonly involved in the glycoprotein disorder portion of the group? RER ribosomes endosomes Golgi apparatus

If a population size does not increase or decrease, what has it reached?

How long do water vapor last in the atmosphere

Which of the following is NOT a correct match? Select one: a. Marius: first to allow landless citizens to become soldiers b. Sulla: first general to seize Rome and name himself dictator without time limit c. Pompey: member of the First Triumvirate d.

Organisms are classified as producers or consumers according to the way they

Recent research into the biological roots of homosexuality has focused on

Which of the following is a result of burning fossil fuels for energy? A. acid rain B. all of the above C. increased carbon dioxide levels in the atmosphere D. production of electricity

What is trophic cascade as mentioned in this video titled "How Wolves Change Rivers?" A• how the rivers flow throughout Yellowstone National Park.