Diagram and label a cross section of 1) a woody stem before the vascular cambium becomes active
and 2) a woody stem from the same plant after the vascular cambium has been active for a
considerable length of time. What will be an ideal response?
Your first diagram should be similar to that shown in Fig. 35-3 part 1, and your second diagram should
be similar to that shown in Fig. 35-3 part 3.
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Four of the following were innovations that led to new adaptive zones. Select the exception
a. flight-capable wings in birds b. amniotic eggs in early reptiles c. Galápagos finches evolved to eat differently sized seeds d. sperm cells carried in pollen grains in seed plants e. silk glands in spiders
What is the material contained within the cell walls of acid-fast bacteria that prevents most stains from penetrating the cells?
A) Mycolic acid B) Peptidoglycan C) Glycolipid D) Lipopolysaccharide
Research has revealed that the development of psychological well-being and growth is influenced by what?
A. pheromone levels B. associative learning C. imprinting D. physical contact E. sensitization
Where would you place the actual extinction date of a taxon if you knew that the Signor–Lipps effect was at work?
a. exactly at the date of the last known fossil b. before the date of the last known fossil c. after the date of the last known fossil d. unable to determine when extinction occurred relative to the date of the last known fossil.