Why did the bird swarms start to throw themselves at the people and the buildings? in the movie core

Which type of bond is present in hydrogen sulfide (h2s)? the table of electronegativities is given. a. hydrogen b. ionic c. nonpolar covalent d. polar covalent

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.

How can the number of core electrons be determined from the periodic table