The independent, or?/? variable, is a factor that's intentionally changed by the experiment.

Materials essential to life processes move across a cell membrane through a variety of methods. What cell membrane structure allows water-soluble materials to be passively transported to the cytoplasm? A. hydrophilic phospholipid tails B.

Which type of organism generates oxygen and makes up the lowest trophic level in an energy pyramid? A. producers B. omnivores C. herbivores D. consumers

How do obligate aerobes and obligate anaerobes differ in their interactions with the atmosphere? A. Obligate aerobes require oxygen from the atmosphere for survival, while obligate anaerobes do not. B.

What idea is expressed in the first paragraph? preface to leaves of gras?

Suppose you found an igneous rock that had almost even amounts of silica, iron, and magnesium. How would you classify this rock? Why?

What is the responsibility of a scientist? O A. To earn money O B. To study the physical world O C. To influence voters O D. To run governments

Which organ of the body stores the waste materials produced by the kidneys?

In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette

On earth viruses are not considered living systems because they cannot reproduce on their own ... what could we assume if we found viruses anywhere else in the universe

Name the functions of the four components of the digestive system: G1 Tract