Body cells need a constant supply of oxygen to function normally . humans must maintain a blood oxygen level of 95-100% to allow their body cells to maintain homeostasis. some illnesses can cause a persons blood oxygen level to be lower than the normal range . if a persons blood oxygen level is 92.4% , by what percent must it be raised to reach the low end of normal (95%)?

Match the terms with the appropriate descriptions. 1. font readers often have difficulty making it to the end of this sort of email 2. spam or chain letters never forward these 3. language, vocabulary, and tone these should be appropriate for the receiver of your message 4. permanent the style, size, and color of this should be easy to read 5. long and rambling email is this sort of written record

Each autumn the forest floor is covered by leaves that have fallen from trees which type of organisms is most effective in decomposing the leaf tissue allowing the nutrients and minerals to be recycled in the environment?

Suppose you are making a map of stars around the sun, and you draw earth 1 cm from the sun on your map. the brightest star in the night sky is 8.6 light-years from the sun. on your map, how far would you place that star from the sun?