The embryonic layer found only in bilaterally symmetrical eumetazoans is the ________.

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


mesoderm

Biology & Microbiology

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How does radiometric dating work?

1.Cooling of molten rock produces particular mineral structures that can be used to determine when a crystal formed. 2.Radioisotope decay speeds up over time, so a graph can be made to predict the date. 3.Although ratios of atoms cannot be determined precisely, their half-lives can be used to predict an approximate date that a crystal formed. 4.Fossils older than 60,000 years can only be dated using carbon 14 since all other atoms will have decayed since then.

Biology & Microbiology

Which condition shows 100 percent penetrance?

a. sickle cell disease b. cystic fibrosis c. polydactyly d. camptodactyly e. eye color

Biology & Microbiology

Which of the following best describes cyanobacteria?

A. They all can use H2S as a source of electrons for photosynthesis. B. They carry out oxygenic photosynthesis. C. They carry out anoxygenic photosynthesis. D. Their photosynthetic pigments are carried in chlorosomes.

Biology & Microbiology

The nitrogenous base found in RNA but not DNA is ________

Fill in the blank(s) with correct word

Biology & Microbiology