What vital element missing from the atmosphere affected the type of life cells first formed on Earth?
a. Ammonia
b. Carbon dioxide
c. Oxygen
d. Nitrogen
c
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Some codons are recognized by proteins, not by tRNAs.
Answer the following statement(s) true (T) or false (F)
A cat grooming another cat is an example of ________ communication
Fill in the blank(s) with correct word
Classification.Respond to the following statements with reference to the flower parts listed below.
A. Haploid cell that gives rise to the female gametophyte. B. Mitosis and differentiation of this structure produces pollen grains. C. Structure in which a female gametophyte forms. D. Ovules form inside this structure. E. Embryo sporophyte packaged with nutritive tissue inside a protective coat.
Oxygen gas (02) is one of the strongest oxidizing agents known. The explanation for this is that ________.
Fill in the blank(s) with the appropriate word(s).