A blastula is

a. a digestive organ.

b. the innermost germ layer.

c. a layer of embryological tissue.

d. a hollow ball of cells in an embryo.

Which of the following is an output of photosynthesis

Are polar bears sexual or asexual

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How do the solar system models of Ptolemy and Copernicus differ?

Water molecules are heated until they become water vapor A) potential energy increases and kinetic energy decreases B) kinetic energy increases and potential energy decreases

Which statement about the cell membrane is true? A. It contains cellulose and sugars that are involved in communication. B. It is present in animal cells only. C. It is rigid and elastic for supporting the cell's shape. D.

Hailey needs to identify internal costs so she can price her product accordingly. Which cost will be part of Hailey's calculation? A. cost of endangering species B. cost of deforestation C. cost of air pollution D. cost of disposing by-products E.

What is the main difference between prokaryotic and most eukaryotes cells? A. Eukaryotic cells from multi-cell tissues, Prokaryotic cells are single cell. B. Eukaryotic cells from single cell, Prokaryotic cells are multi-cell tissues. C.

List (A) the primary materials necessary for and (B) The materials produced by photosynthesis

How is fermentation different from cellular respiration?