The notochord in embryos serves a similar function to the what in adults?

In a human, the ________ provide(s) a common passageway for both food and air

A) bronchioles B) trachea C) pharynx D) alveoli

A zygote is a fertilized egg formed by an egg and a sperm. The zygote undergoes many mitotic events as it develops into a solid ball of cells (ie, blastomeres) called a blastula. What changes occur in this early cleavage?

A. During the initial stages of cleavage, there is a tremendous increase in the number and size of blastomeres. B. During the initial stages of cleavage, there is no increase in the number of cells of the developing organism, but the size of the cells increases. C. During the initial stages of cleavage, there is a tremendous decrease in the number and size of blastomeres. D. During the initial stages of cleavage, there is a tremendous increase in the number of cells coupled with a decrease in the size of the cells composing the developing organism.

The type of cleavage seen in deuterostomes is called ________ cleavage.

Fill in the blank(s) with the appropriate word(s).

Suppose that a meteorite crashes into Earth and a sample of it is taken to a local research lab for analysis. Embedded several inches within the rocky structure, a microscopic cluster of dormant, spore-like structures is found

The scientists culture some of this material in a standard microbiological nutrient broth, and they are surprised to find many single-celled "organisms" moving around, growing, and reproducing in the broth. The "organisms" behave the same in both daylight and dark conditions, do not require oxygen, and thrive under a wide range of temperatures and pH levels. They stop moving, growing, and reproducing, however, when fewer nutrients are available in the medium. In this scenario, the "organisms" most closely resemble a(n) A) nonliving virus. B) autotrophic species of Eukarya. C) heterotrophic species of Eukarya. D) photosynthetic species of Bacteria. E) heterotrophic species of Archaea.