Which of the following is not a community?
a. the microorganisms living within the soil of your yard
b. the life within a pond
c. the organisms living within a dead tree in a forest
d. the population of western gulls on a beach
e. nurse logs which shelter plants and other organisms
D
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Most organisms are dependent upon plants
because
a. plants produce oxygen as a by-product of photosynthesis. b. as producers, they form the base of food chains. c. they function to prevent erosion and reduce desertification. d. as they remove carbon dioxide from the atmosphere, they reduce the problems generated by the greenhouse effect. e. all of these apply
A stem cell is a cell that ____
a. can differentiate into specialized cell types b. has already differentiated c. can develop into two or three cell types d. can only develop into skin cells e. can only develop into bone cells
Insulin lowers blood sugar. If insulin levels are high shortly after a meal, we can conclude that insulin secretion is regulated by ________ feedback mechanisms
Fill in the blank(s) with correct word
You come across a recipe for rhubarb pie. Never having heard of rhubarb, you do a little research. You find out that the part of a rhubarb plant that people eat is the petiole of a large leaf. You purchase some rhubarb for your pie and notice that it contains many long stringy fibers. Based on your knowledge of plant tissues, you know that the stringy fibers are
A. phloem tissue. B. sclerenchyma tissue. C. parenchyma tissue. D. collenchyma tissue. E. xylem tissue.