Expressed Powers | Definition & Example Expressed Powers: Superman, as any American knows, can fly. He also has X-ray vision and is really very strong. How do we know these things? They are expressed both verbally (when Superman tells people what he can do) and non-verbally (when he just does them). Powers that aren’t made […]
Behavioral Isolation | Definition & Example The different mating rituals of animal species create extremely powerful reproductive barriers, termed sexual or Behavioral isolation, that isolates apparently similar species in the majority of the groups of the animal kingdom. In dioecious species, males and females have to search for a partner, be in proximity to each other, carry […]
Ballista The ballista (Latin, from Greek βαλλίστρα ballistra[1] and that from βάλλω ballō, “throw”), plural ballistae, sometimes called bolt thrower, was an ancient missile weapon that launched a large projectile at a distant target. Developed from earlier Greek weapons, it relied upon different mechanics, using two levers with torsion springs instead of a tension prod […]
