Help please. 19a. basic si units of electrical current (7) *****E*. 25a. Home of Norse Gods in mythology (6) *S****D. 16d. Spike of unisex flowers found on wind pollinated plants such as willow (6) C*T*I*. 20d. Greek astronomer who was the first to calculate the Earth's circumference scientifically. 32d Belief system in which spiritual beings influence human events (7) *N*M*S*. Many thanks