Hi I am in the 7th grade and have a test tomorrow over cells and level of organization does anyone have any tips or facts about to this?

The first element on the periodic table of elements is carbon. a. true b. false

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

What type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? view available hint(s) what type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? salt bridge disulfide bridge hydrogen bond hydrophobic interaction