The diagram represents a tundra food web. Brown Bears
Arctic Hares
Arctic Wolves
Musk Oxen
Lemmings
Caribou.
Grasses
Lichens
Snowy Owls
Caribou moss
Based on the diagram, what would be the results of the number of lemmings in the ecosystem declining? Select all that apply.
А
Brown bears and snowy owls would have to rely more on other organisms for their energy
B
There would be fewer lichens and grasses available for other organisms to consume.
C
The ecosystem could support more caribou and musk oxen.
D
The ecosystem could support fewer arctic wolves.

Chlorophyll is found in plant leaves and absorbs light from the sun to enable plants to perform photosynthesis. magnesium is an important component of chlorophyll. the concentration of magnesium ions is higher in the root-hair cells of plants than in the soil. which mechanism of ion uptake would best enable a plant to produce a steady supply of chlorophyll? osmosis diffusion passive transport active transport

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.

The serengeti plains are part of the african savanna ecosystem and are home to a variety of different species of plants and animals. the serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce. which type of limiting factors does the seasonal drought in the serengeti plains affect?