As large tracts of rain forest disappear due to human activities, the region tends to become drier. Why?
What will be an ideal response?
Trees can quickly take up the water that falls to the ground, and much of the rainfall in a rain forest comes from water transpired from the forest's leaves, thus producing an internal, regional cycle of water.
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Cytokines produced by lymphocytes are often called
A) interleukins. B) pathogen recognition receptors. C) chemokines. D) epitopes.
Which of the following statements is true regarding anammox?
A. It can be carried out by both eukaryotes and archaeons. B. It generates less energy compared to respiration. C. It is performed in oxygen-rich environments. D. It is identical to nitrogen fixation. E. All of these answer options are correct.
Which is a type of lymphocyte that forms in the bone marrow but matures in the thymus gland?
A) lymphoma B) B cell C) T cell D) none of the above
A breakfast cereal is advertised as containing essential vitamins and minerals. In this context, the word essential means __________.
a. that the substances contain the "essence" of the vegetables from which they are extracted b. that they are the nutrients that should comprise the largest component of our diet c. that they are necessary for life d. that the nutrients must be supplied in the diet and cannot be made in the body e. nothing: this is just a gimmick