Which of the following is not true of animals that have open circulatory systems?

1.they have a mechanism to pump circulatory fluid.

2. they are not vertebrates.

3. they have lower pressure in their circulatory compartments compared to animals with closed circulatory compartments.

4. almost all of them have specialized gas transporting blood cells

Astudent sees several ants walking up a wall following the exact same trail that an ant took earlier. she wants to apply the scientific method to determine how the ants detected the trail. which of these steps would come first in her application of the scientific method? perform an experiment by cleaning the scent away from part of the trail. draw a conclusion that the ants follow a scent trail. make a prediction about what the ants will do after she cleans away part of the trail. hypothesize that the ants are following a scent trail that the first ant left.