The material in the gray crescent of a frog embryo is necessary for normal development
Indicate whether the statement is true or false.
T
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Which of these will respond most strongly to red light?
a. S cones b. L cones c. M cones d. rods
How is light focused on the retina?
What will be an ideal response?
Based on the figure, which of the following statements is most likely accurate?
A. HIV arose more than once.
B. HIV and SIV are not genetically related.
C. The SIV strains will all have more sequence similarity with each other than with any of the HIV groups.
D. SIV only arose once.
E. HIV groups M, N, and O will be more similar to each other than to SIV.
In the evolution of the first cells on the developing planet Earth, polymers had to evolve. The following support this path toward cell development EXCEPT for
A. amino acid exposure to amino acids were shown to abiotically polymerize by Fox B. clay was helpful in the polymerization of proteins and nucleic acids as shown by Cairns-Smith C. Chech and Altman's RNA first hypothesis D. adaptive radiation