You are studying the pathway of pigment synthesis in the fictitious bacterium, Bacterium colorificus. Wildtype bacteria are red. You have three mutant strains, with altered colors.
Genotype Phenotype
m1+ m2+ m3+ red (wild type)
m1- m2+ m3+ orange
m1+ m2- m3+ yellow
m1+ m2+ m3- colorless
m1- m2- m3+ orange
m1+ m2- m3- colorless
m1- m2+ m3- colorless
To help you answer the following questions, draw the pathway based on this information, indicating enzymes (m1, m2, m3) and intermediates (colorless, yellow, orange).
1) Select the option that correctly indicates which intermediate should be assigned to which letter in the blank pathway below.
A. A = colorless; B = orange; C = yellow
B. A = colorless; B = yellow; C = orange
C. A = orange; B = colorless; C = yellow
D. A = orange; B = yellow; C = colorless
E. A = yellow; B = colorless; C = orange
F. A = yellow; B = orange; C = colorless

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .

the answer is c. altitude. hope this ! #brainiac

oxygen is the first element in group 16 (via) of the periodic table. the periodic table is a chart that shows how chemical elements are related to each other. the elements in group 16 are said to belong to the chalcogen family. other elements in this group include  sulfur, selenium, tellurium,  and  polonium.  the name chalcogen comes from the greek word  chalkos,  meaning "ore." the first two members of the family, oxygen and sulfur, are found in most ores.

oxygen is by far the most abundant element in the earth's crust. nearly half of all the atoms in the earth are oxygen atoms. oxygen also makes up about one-fifth of the earth's atmosphere. nearly 90 percent of the weight of the oceans is due to oxygen. in addition, oxygen is thought to be the third most abundant element in the universe and in the solar system.