A niche is an organism's role in an ecosystem. Which of the following best describes the niche of the wood mushroom in a forest ecosystem?

The duodenum of the small intestine being squirted by bile how it works

The drug Viagra® counteracts the effects of NO on penile blood vessels. a. True b. False

Los agujeros negros no son negros. Cierto Falso

DNA and RNA differ in all BUT the following ways. A) DNA is double-stranded, while RNA is single stranded B) RNA uses the sugar ribose in its backbone, while DNA uses deoxyribose C) DNA contains the base uracil, while RNA can move around the cell D)

What makes evolution a theory? O A. It is supported by data. O B. It is a guess by scientists. O C. It is not proven. O D. It is a hypothesis.

John wants to test how temperature affects the mass of sugar that can be dissolved in water. Which of the following factors will John expect to change in response to the differences between the control group and the experimental group? O A.

The lion's scientific name is Panthera leo. The leopard's scientific name is Panthera pardus. The tiger's is Panthera tigris. Which statement is true? A) All 3 animals share a genus. B) All 3 animals share a species.

Humans have a huge impact on ecosystems today. Talk about why we can no longer study most ecosystems that have not been touched by humans. Talk about some of the large scale issues we are causing in our environment and ecosystems today.

Why is it important to identify the presence of fecal contamination in the enviorment?

An aquifer has been compared to a sponge. Think about this analogy for a moment explain why the use of the word quotations "sponge" is more appropriate in the use of "underground river" quotes to describe aquifers.