The fossil pictured above came from the st. clair site in pennsylvania. the fossils are formed in black slate of the pennsylvanian period, 300 million years ago. the fossils found at this site are comprised of ferns and trees. this fossil record for this time period in pennsylvania indicates that the environment was a
a) desert
b) deep ocean
c) shallow sea
d) thriving forest

How many electrons does silver have to give up in order to achieve a sido noble gas electron configuration

When svante arrhenius first proposed his acid-base theory, he was a doctoral candidate. his professors thought his ideas were unfounded. within a decade, the arrhenius theory of acid-base was widely accepted and praised within the scientific world. arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable a) barium. b) hydronium. c) hydroxide. d) oxygen.

Afusion reaction takes place between carbon and another element. neutrons are released, and a different element is formed. the different element is a) lighter than helium.b)heavier than helium.c)the same weight as helium.d)dependent on the element that reacted with carbon.