Cytotoxic t cells can attack target cells with which of these chemical weapons?
a) secrete strong acid b) secrete organic solvent c) secrete free radicals d) secrete a cytokine that triggers apoptosis e) secrete mutant proteins

Here's one way to follow the scientific method. place the missing steps in the correct position in the process.

20 point pls brianliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?

In "the pig," what is the main effect that the piglet initially has on kibuka?