Geoengineering includes a variety of large-scale efforts to reverse global climate change. One geoengineering concept involves releasing large amounts of iron-containing
fertilizers into oceans. The increased concentration of iron in ocean water would
theoretically increase the rate of photosynthesis carried out by phytoplankton. Why are
such ideas controversial?
A. Photosynthetic algae would increase, not decrease, atmospheric carbon
dioxide.

C. Scientists cannot agree whether carbon dioxide in the atmosphere relates to
global climate change.
D. Scientists cannot predict what other unintended effects large concentrations
of iron may have.

Alichen is an organism that structurally appears to be a single organism. but a lichen is actually two different organisms—a fungus and green algae—living together as one organism. the fungal partner derives its nutrition from the photosynthesizing algae. how does a lichen differ in its photosynthetic activity from elysia chlorotica, the sea slug that’s considered to be a photosynthesizing animal? a. in lichens, the fungi photosynthesize on their own, while elysia chlorotica forms a relationship with a photosynthesizing plant. b. in lichens, the relationship with the algae lasts throughout the life cycle, but in elysia chlorotica, the relationship occurs only during the immature juvenile stage of the slug’s life cycle. c. lichens can photosynthesize only because of the living algal partner, while elysia chlorotica incorporates chloroplasts from algae into its cells. d. in lichens, the association between the fungi and algae is permanent, while elysia chlorotica associates with a photosynthesizing organism only when it requires food.

Which is the correct first step in finding the area of the base of a cylinder with a volume of 26x cubic meters and a height of 6.5 meters? v=bh 6.5=b(26x) v=bh v=26pi+(6.5) v=bh v=26pi(6.5) v=bh 26pi=b(6.5)

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation