If ablack hole is formed by high-mass dead stars, then what high-mass object forms black holes? Answer choices: - layers of fat - an object - dead stars - moons - graptolites - shooting stars - milky way - It expands
dead stars

(Question)
If hitting a rock causes vibration, then hitting a rock causes what? Answer choices: - heat energy - erosion - energy - friction - flooding - squeeze - contamination - vibration
(Answer)
vibration

Ques: If active immunity can persist in the circulation for decades, then what can persist in the circulation for decades? Answer choices: - active immunity - density - Veins and arteries. - oxygen cells - bacteria - chlorofluorocarbons - fur and fat - Chemical energy
Ans: active immunity

(Q).
If melting changes ice to water by adding heat energy, then what changes ice to water by adding heat energy? Answer choices: - mussels - melting - freezing - fertilization - storms - boiling - engines - condensation
(A).
melting

Ques:If changes in soil pH rob humans of nutrients, then what can changes in soil pH do? Answer choices: - Damages them - It decreases - death and devastation - Increase human wealth - Rob humans of nutrients - Cause humans happiness - Destroy crops - Give humans pleasure

Ans:Rob humans of nutrients

Ques:If some worms kill their host, then what do some worms do to their hosts? Answer choices: - Copy them - reproduce - Play with them - harm them - Show them things - Kill them - migrate - Damages them

Ans:
Kill them