Which of the following animals possess a central nervous system?
Jellyfish
lobsters
fish
starfish

What claim did thorne make? what evidence supported his claim?

What type of specimens where you able to see under each of the microscopes in the microscope activity

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation