The lower end of the uterus is nearly closed by a ring of connective tissue called the ________
Fill in the blank(s) with correct word
cervix
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What is an area of the Earth's surface currently undergoing primary succession?
A. Orange groves in Florida B. Redwood forests along the northwestern U.S. coast C. Volcanoes in Iceland. D. Shallow seas with low productivity
Transgenic crop plants are primarily developed for which of the following reasons?
a. To improve disease resistance b. To study patterns of inheritance c. To facilitate genetic testing d. To develop new vaccines
A nucleotide is composed of at least one sugar, one phosphate group, and ____
a. one nitrogen-containing base b. one amino acid c. multiple cholesterol molecules d. fatty acid chains e. ATP
Scientists developed the ________ model after their studies of the fossil record revealed that some species appear quite suddenly and then remain essentially unchanged phenotypically for a long period of time.
A. Urey-Miller B. Hardy-Weinberg C. gradualistic D. punctuated equilibrium