Mendeleev found that when he arranged the known elements according to their atomic mass, the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements. This led to the generalization now known as
A. valance electrons.
B. the periodic table.
C. the octet rule.
D. an atomic model.
Answer: C
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Answer the following statements true (T) or false (F)
1. Sexual selection is a type of natural selection resulting from variation in the ability to find mates. 2. Today, 40% of hospital Staphylococcus infections are resistant to all antibiotics except one. 3. Evolution does answer the question as to how life originally began. 4. Artificial selection is responsible for many breeds of dogs and cats. 5. Darwin believed that because of "differential reproductive success" a population would change over time
Cardiac muscle cells are ____
a. involuntary b. spindle-shaped c. multinucleated d. slow contracting e. found in the walls of blood cells
A botanist conducted an experiment to test the effect of light on plants. Fifty plants of a flowering species were grown for 60 days under different lengths of artificial daylight. Flowers could be white or pink based on the parent plant genes
The amount of water and fertilizer provided was constant. At the end of the experiment, the size of each leaf for all plants is measured. What is the dependent variable in this experiment? A) duration of artificial daylight B) flower's color C) leaf's size D) duration of the experiment
The first cells were probably ________ cells.
Fill in the blank(s) with the appropriate word(s).