Chemical evolution may have become relatively sophisticated before cells first arose in ________
a. hydrothermal vents and on clay particles in shallow mud flats
b. nebulae
c. algal mats and stromatolites
d. hydrothermal vents and stromatolites
a
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Paedomorphosis is
A. the formation of limbs from fins in the evolution of land vertebrates. B. the change from radial to bilateral symmetry in the evolution of plants and animals. C. the retention of juvenile traits in an adult organism. D. an earlier development of adult traits in an organism. E. the development of different types of eyes from a simpler form.
__________ are small leaves with a single vascular strand
a. Megaphylls b. Microphylls c. Thalli d. Strobili e. Sori
An element has eight protons, nine neutrons, and eight electrons. Its atomic number and atomic mass, respectively, are __________.
a. 8 and 16 b. 8 and 17 c. 9 and 16 d. 9 and 17 e. 16 and 8
Anoxygenic photosynthesis typically results in the production of (oxygen/sulfur/ammonia) as a waste product
What will be an ideal response?