I believe the answer would be Crossing Over.
Hope this helps.
From smallest to largest. That will be
Cell; cheek cell
Tissue; hydra
Organ; heart
System; digestive system
Organism; lion
Tissue is a group of cells, an organ is a group of tissues, a system is a group of organs, an organism is a group of systems
Hope that helped. Have a nice day
Answer:
universities allowed scientist to investigate what they thought even if they were contradicted catholic teachings.
There is no difference in mental abilities between genders
Either C or D. I think C, but I'm not too sure...