Which two space shuttle's were lost to explosions?

How long could an astronaut survive on mars without a spacesuit. Would she suffocate, boil, or freeze to death?

Which forms when a humid air mass rises into a cooler temperature area?

Most of the species in the class _ lay amniotic eggs

Because it uses it for protection, the African crested rat is dependent on which of the following? a. Acokanthera tree b. Venus flytrap c. Anopheles mosquito d. Fire ant

How are bacteria beneficial to the body? a. they provide us with needed nutrients c. they invade sterile regions in our body b. they form biofilms d. they fight the immune system

Which factors affect a rivers load

Which sentence best captures a central idea of the biography

Is a fossil still a fossil if it is preserved artificially? For example, (Is a mummy a fossil even though it was preserved by people?)

Which type of macromolecule is the quickest source of energy for the body

Which two structures contain DNA