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

Which topic could be investigated using the scientific method, with the investigation organized around a appropriate research question?

As opposed to external fertilization, internal fertilization ensures that a. the number of sperm and eggs produced will be equal. b. all of the sperm will fertilize eggs. c. only the fittest of sperm and egg combinations will survive. d.

Viruses contain dna or rna, but lack genes necessary for metabolism and reproduction. why are viruses not considered to be alive?

Dehydration means water loss. synthesize means to put together. explain why the chemical process responsible for building a carbohydrate, a fat or a protein is called dehydration synthesis?

Select all the correct answer. Dan grows different crops on his land at specific times of the year, considering the prevalent climatic conditions.

What information can be inferred about genes that are located on different chromosomes? what information can be inferred about genes that are located on different chromosomes? these genes are always inherited together.

Bianca is very self-conscious about her weight. she indulges in strict dieting and often skips her meals. as a result, she was recently diagnosed with osteoporosis, an abnormal condition related to the thinning of bones.

All processes of moving materials across the plasma membrane are classified as either A) diffusion or osmosis B) passive or active transport C) phagocytosis or pinocytosis D) endocytosis or exocytosis

What three factors does a species diversity index take into account? a. Species richness, species diversity, and species productivity b. Species richness, species abundance, and species evenness c.

Wins or losses are the ultimate measure is competitive sports. True or false?