On a farm, a group of squirrels collect acorns from an oak tree. Not all the acorns are collected on the ground, the birds can also eat the acorns. These nuts are spread around the land by both the animals resulting in new trees growing on the farm. What level of organization is represented in the example and how do you know?

9. the history of life on earth is recorded in

Climate warming trends allow plant and insect species to inhabit larger ranges. select the best answer from the choices provided

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.