Introduction: In this lab you will apply what you have learned about succession to the ecological changes that occur in an abandoned hay field. After only 5 years, several types of trees have begun to grow
where there was once only hay. You will observe, by counting, the number and types of trees that grow in
this field 5, 20, 50 and 100 years after abandonment.
Procedure A: For each figure 1-4, count how many of each species of tree are found in the field, using
the key as a guide. Add up all of the trees to find the total number of trees. You will then calculate the
percentage of each tree species at each observed time period. Use the following formula: Number of
specific free - TOTAL number of trees =
X 100 =
%

this protocol provides a detailed procedure for agarose-based ip to purify and enrich the protein of interest.

the answer is c.

by: nicholas dooley

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.