Describe how population size of lobsters affects the extent of kelp forests on the North Atlantic coast of North America
What will be an ideal response?
Lobsters off the coast of Nova Scotia are the dominant predators of sea urchins in kelp forests. When the population size of lobsters declines as a result of overfishing, the population size of sea urchins explodes with devastating effects on kelp forests. The unchecked urchins graze down the young kelp plants before they grow to any meaningful size and the urchins will also eat away at the holdfasts of kelp plants. This will weaken these algae in the face of winter storms and leads to a reduction in the size of kelp forests.
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Which of the following is false concerning
stem cells? a. They are undifferentiated cells. b. They arise from a fertilized egg. c. They can be coaxed to differentiate. d. They are obtained from a portion of a plant body. e. They may help mend damaged tissue
How is it possible for living organisms to comply with the second law of thermodynamics?
A) Sunlight functions as an ultimate source of energy for most forms of life on Earth. B) Chemical reactions inside cells mostly cause an increase in high-level energy. C) Organisms are able to function efficiently on heat energy alone. D) Living organisms are unique in that they do not require energy for survival. E) Living organisms are totally isolated systems that are not subject to the laws of physics.
Water contamination refers only to the presence of excess or non-endemic microbes.
Answer the following statement true (T) or false (F)
The uterine lining proliferates during the female cycle and then sloughs off in what process?
A. Fertilization B. Menstruation C. Placentation D. Ovulation E. Implantation