Why do we seldom see more than three consumer levels in natural systems?
1.There is not enough energy to support additional levels.
2.Animals haven’t evolved to feed on animals at the third level.
3.Humans take over the role of the fourth-level consumer.
4.There isn’t enough habitat for a fourth level.
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Which statement about mitochondria is true?
a. Mitochondria are surrounded by two membranes b. Mitochondria are less than 1 micrometer in length. c. Mitochondria are able to survive outside the cell. d. Mitochondria have linear DNA chromosomes.
Batrachochytrium dendrobatidis, which reproduces asexually through the production of zoospores, recently destroyed populations of harlequin frogs in Central and South America. It is a member of which phylum of fungi?
A. Zygomycota B. Basidiomycota C. Glomeromycota D. Chytridiomycota
Menopause normally occurs around age 60, when women stop menstruating and their ovaries are no longer working.
Answer the following statement true (T) or false (F)
Where are cilia found in the human body?
A) lining blood vessels B) oral cavity C) female reproductive system D) upper respiratory tract E) large intestine