30. Which of the following is true in reference to the anatomy of leafs? A. The mesophyll layer of monocot leafs consists of palisade and spongy parenchyma cells and
is located between the upper and lower epidermis.
B. Spongy parenchyma cells are loosely arranged and are of irregular shape allowing gas
exchange between the leaf and outside environment via stomata.
C. Chloroplasts can be found within all epidermal cells, as well as both types of mesophyll cells.
D. Vascular bundles contain only xylem cells which transport photosynthetic products from
leafs to other parts of the plant.

4.06 hc)a five-year review of threats to the southern resident orca population of the united states concluded that the top threats were prey availability, contaminants, and effects from recreational and whale watching vessels. further down the list are oil spills, disease, and effects from commercial vessels not targeting whales. how might this list be different if it were for transient whale populations, which have a larger average population size and live farther offshore in open waters? a)the transient population is more likely to be affected by contaminants. b)the transient population is less likely to be affected by whale watching vessels. c)the transient population is more likely to be affected by disease. d)the transient population is less likely to be affected by prey availability.

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?

Scientists discover two populations of mice on either side of a major river. the two populations have almost identical genes but the mice from one side cannot breed with mice from the other. this is most likely because