Students made a model ecosystem on their school lawn. They dropped equal numbers of different colored toothpicks in the green grass to represent worms. They pretended to be birds and were given one minute to pick up as many toothpicks as they could. They picked up more red and blue tooth picks than green. What concept does this model represent? a. That all toothpicks can easily be seen in the grass.
b. That animals like to eat things that are red and blue.
c. That camouflage is an adaptation that helps animals escape predators.
d. This activity is not like nature.

2. if scientists identify an animal with bilateral symmetry and no segmentation, which phylum can it definitely not belong to? a. roundworms b. annelids c. mollusks d. flatworms

List two modern organisms that have pentameral symmetry

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.