The continents of africa and south america used to "fit together" like puzzle pieces. about how far back in time would you have to go to find africa and south america connected together?
*600 million years
*430 million years
*150 million years
*90 million years

Iknow #2 is d. i just need to know why

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?