Using standard conventions for naming alleles, which of the following pairs is correct?
a. Tt?recessive phenotype.
b. TT?heterozygous.
c. tt?homozygous.
d. tt?dominant phenotype.
e. All of these are correct
C
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An ____ is a break or erosion in the cells lining the stomach
Fill in the blank with the appropriate word.
Although there are fewer than 14,000 living species of seedless vascular plants, they were the
dominant plants on Earth for nearly 200 million years. Their dominance ended at the end of the Carboniferous period, about
a. 1.5 billion years ago. b. 420 million years ago. c. 250 million years ago. d. 125 million years ago. e. 17 million years ago.
Refer to Figure 44-1 in the book. To which group are sponges more closely related?
A. choanoflagellates B. bilaterians C. equal relationship to both choanoflagellates and biletarians
Please match the statement to the term that it most accurately describes, to test your understanding of types of symbiotic associations.
Commensalism A) Organisms living in obligatory but mutually beneficial relationships. B) One organism benefits while the other organism is neither harmed nor benefited C) One organism is harmed when it provides the other organism with nutrients and a habitat