In 1909, Charles Walcott discovered fossils in the Burgess Shale of the Canadian Rockies. The area was formed by an underwater mudslide that provided an oxygen free environment, so decomposition was minimal. Why was this site particularly important to the fossil record?
A. It contained fossils from the Cambrian period.
B. It contained both vertebrate and invertebrate fossils.
C. It contained fossils of well preserved soft tissues of invertebrates.
D. It showed that mudslides could occur underwater.
E. The first bird fossil, Archaeopteryx, was found here.
C. It contained fossils of well preserved soft tissues of invertebrates.
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Which of these can found in oak wood but not in pine wood?
A. secondary xylem B. secondary phloem C. vessel members D. tracheids E. ray cells
Water molecules are attracted to one another because the ____
a. slightly positive charge of the hydrogen atom from one molecule of water attracts the slightly negative charge of the oxygen atom from another molecule b. slightly negative charge of the hydrogen atom from one molecule of water attracts the slightly negative charge of the oxygen atom from another molecule c. slightly positive charge of the hydrogen atom attracts the oxygen within the same molecule of water, which leads to an increase in its polarity
d. water molecules participate in non-polar covalent bonds, which increase the attraction of the molecules to each other e. water molecules bind to each other through their mutual attraction to ionic compounds
Which antibody makes up about 80% of the antibodies in the blood?
a. IgA b. IgD c. IgE d. IgG e. IgM
Using a radioactive molecule to identify which membrane proteins bind the molecule is called ________
Fill in the blank with correct word.