Which gland requires the element iodine to produce its hormones?
A) thyroid
B) pineal
C) anterior pituitary
D) ovary
A
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Homeotic genes encode very important transcription factors that specify the identity of body parts or segments during development
For example, the development of legs on thoracic segments T1, T2, and T3 and wings on segment T2 is controlled by homeotic genes. A. true B. false
A stream flows through marshes, farmland, and suburban housing developments before emptying into the ocean. Describe three ways in which the different land areas along its course affect the water quality of the stream.
What will be an ideal response?
A(n) ________ is a separate group of organisms incapable of interbreeding with other such groups.
Fill in the blank(s) with the appropriate word(s).
A covalent bond is formed when:
A) two atoms share electrons. B) one atom gives up electrons to another atom. C) two nonpolar molecules associate with each other in a polar environment. D) two polar molecules associate with each other in a nonpolar environment. E) a positively charged particle is attracted to negatively charged particle.