The universe began in an incredibly hot and dense state about 13.8 billion years ago. Since this time, it has been rapidly expanding, causing galaxies to move away from one another. Energy in the coldest depths of space can be explained as radiation left behind from the universe's early, more energetic state.

Describe two recent or ongoing space missions.

Food contains a sugar called ( ), which is broken down in a process called cellular ( ). this process uses ( ) to break down food molecules and provide energy for cells. fill in the parentheses

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.