This organelle is an intracellular highway composed of membranous sacs and tubules called cisternae​

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?