Jon is researching the oxygenation of Earth's atmosphere. Which unicellular organism do biologists consider to be the main contributor to that process?

A. paramecia

B. amoebae

C. dinoflagellate

D. cyanobacteria

Answer is D. cyanobacteria

What is the connection between the rising concentration of SO2 And NO2x, And The Acid Rain Pollution Alert?

Which of the following is an example of protein denaturation? Choose 1 answer: A) Amino acids fold into repeating patterns due to hydrogen bonding of the peptide backbone. B) Several amino acids are joined together via peptide bonds.

Gigantic mammals (mammoths, giant sloths, etc.) characterize these times. a. Pleistocene, b. Holocene, c. Pliocene, d. Cretaceous

Which of the following statements is NOT true of soil? (3 are true, 1 is not, choose the one that is not true) a. It takes a long time to form b. Living organisms add nutrients to it C. There is one kind of soil in the U. S. d.

Función similar entre tejidos de las plantas y de los animales

What is a storage form of carbohydrate energy?

How Do Soils Form? A. Erosion transports mineral particles, and plants die and decay. B. Plants provide organic matter and minerals to make soil. C. Weathering breaks rocks into minerals, and plants die and decay. D.

Darwin noticed that birds that were good at finding scarce food in the winter had a better chance of surviving and producing offspring.

The chart below shows the codons that make up the genetic code and the sequence of nucleotides that corresponds to them. A mistake during DNA replication leads to a mutation in the nucleotide sequence shown below.

The ability of an enzyme to change shape when it binds to its substrate is called