In an experiment, the condition that is manipulated by a scientist is the

An ecologist catches 100 frogs from a pond, marks them, and releases them back into the pond. after a few days, another 100 frogs are captured and 10 have the marks on them. how many frogs are in the pond?

What is a single change in a nitrogen base called in biology?

3 molecules which include carbon

6.) Which of the following terms describes seasonal movement of individuals into and out of a population? A. Immigration B. Emigration C. Natality D. Migration 7. Which of the following equations summarizes population growth? A.

Which of the following best describes the building blocks that make up proteins? A. four different kinds of nucleotides connected through phosphodiester bonds B. 20 different kinds of amino acids linked through peptide bonds C.

What are the three classifications of epithelial tissue? describe each?

About how much energy is transferred from a primary consumer to a secondary consumer? 90% of the original energy from the Sun 10% of the original energy from the Sun 10% of the primary consumer's energy 1% of the primary consumer's energy

Which feature is used to classify galaxies? age color shape size

What is porins in mitochondria?

How is "bottleneck effect" considered to be a mechanism?