7. According to the fossil record, which group of organisms has existed for the greatest length of time? (1) gastropods (3) mammals

(2) corals (4) vascular plants

positive repressible regulatory mechanism, transcription of the structural gene (s) occurs in a. the absence or presence of the co-repressor b. the absence of the inducer, but not in its presence

How mutation causes genetic variation

When does independent assortment occur

What is the importance of epidermal peeling?

What factor explains why tundra biomes remain cold all year round the Taiga biomes have alternating warm and cold seasons? A. vegetation cover B. average precipitation C. altitude D. latitude

How are babies made ... Asking for a friend

What is the symbol for calcium?

What is the genotype of the offspring missing on the first row of the punnett square? A.) lBlB B.) lAlB C.) lBlO D.) none of the above

Which of the following is the route by which water is transferred from cell to cell in the root section? A. apoplastic pathway b. transmembrane pathway c. symplastic pathway

Which substance requires sunlight for its synthesis?