Despite your best attempts to convince her otherwise, your friend is very afraid of spiders and all "bugs," which to her means insects. When you note that spiders are not insects, she claims they are the same thing. You finally convince her that spiders are not insects because, for one thing, spiders
A. lack an exoskeleton.
B. have a calcium-carbonate layer outside the exoskeleton.
C. are segmented.
D. have two body segments joined by a pedicel.
D. have two body segments joined by a pedicel.
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Answer the following statements true (T) or false (F)
1. Chicken eggs form a blastula through holoblastic cleavage. 2. One outcome of gastrulation is the establishment of primordial germ cells, which represent the cell types that form gametes. 3. Convergent extension, involution, and invagination are ways in which cells move and transform within the embryo. 4. The differentiation of cells into distinct body parts is induced by morphogens.
The hardening of the arteries is known as ____
a. arteriosclerosis b. atherosclerosis c. high cholesterol d. a heart attack e. angioplasty
The general relationship between available light and leaf area index (LAI) is described by
A) Bohr's law. B) Beer's law. C) Leibig's law. D) the Central Limit Theorem.
What was the significance of the 1978 finding by Philip Leder's research group that the 0.7 kb ?-globin mRNA is not colinear with the gene that encodes it, but the nuclear 1.5 kb pre-mRNA is?
What will be an ideal response?