Which lineage of Echinoderms is made up of about 1500 species of sea cucumbers, which are elongated along their oral-aboral axis?
a. Crinoidea
b. Holothuroidea
c. Echinoidea
d. Asteroidea
Ans: b. Holothuroidea
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Purine bases, such as adenine and guanine, have ________ joined ring(s) for their structure, compared to pyrimidine bases, such as cytosine and thymine, that have ________ ring(s) in their structure.
Fill in the blank(s) with the appropriate word(s).
Label the diagram using the following terms: bark; heartwood; sapwood; secondary phloem; vascular cambium.
What will be an ideal response?
Answer the following statements true (T) or false (F)
1. A plant that is dioecious could also have perfect flowers. 2. A bilaterally symmetrical flower has only two equal parts. 3. Plants that are pollinated by insects probably do NOT produce allergy reaction in humans. 4. A dog that is conditioned to salivate in response to a stimulus associated with food will salivate in response to that stimulus even after the food is removed. 5. When body temperature drops below normal, a person starts shivering uncontrollably. This is an example of negative feedback.
Asexually produced daughter cells are
a. identical to each other. b. identical to the parental cell. c. different from the parental cell. d. different from each other. e. identical to each other and to the parental cell.