Considering its total area covered, which ecosystem type represented in the figure above has a very low level of economic impact on Earth's ecosystem?
A) tropical wet forest
B) rock, sand, and ice
C) tropical seasonal forest
D) ocean neritic zone
Answer: B
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The Ti plasmid is naturally found in
A. E. coli. B. Pseudomonas. C. Agrobacterium. D. Staphylococcus. E. E. coli AND Staphylococcus.
What is the structure through which water enters the water vascular system of a sea star?
a. ampulla b. radial canal c. madreporite d. ring canal
Common causes of chronic insomnia include all but this factor:
-May occur as a result of stress -May occur as a result of poor sleep habits -may occur as a result of not eating, causing hunger to keep you up -May last for years
The dermis of mammalian skin, including that of humans, contains a large amount of extracellular matrix proteins, including collagen and elastin. As a person ages, the amount of elastin in the dermis declines
Which of the following cell types is likely to be the cause of this change in the dermis of the skin? A. keratinocytes B. fibroblasts C. melanocytes D. epidermal cells