Ferns have groups of sporangia called:
a. spores
c. rhizome
b. prothallium
d. sori

Ialready know the answers to these questions and they are on the attachment. but i just need to know why that answer is the correct one. plz asap! this is for a report that i need to email by 10!

18. over time, how do sand dunes tend to migrate? a. perpendicular to the movement of the wind b. in the same direction as the wind blows c. toward the wind d. in random directions

First described the system of fingerprint ridges and spirals, which eventually were used for fingerprinting. a.) fare and fidelis’s pathology b.) dr. calvin goddard c.) hans gross d.) marcelo malpighi e.) leeuvenhoek’s microscope