What holds phospholipids together in a bilayer formation?

Look at the following answer choices and determine which belongs in the both category. testable, can be disproven explains natural phenomena, has evidence to support it prediction, tentative, one or more scientists working together well established, many different scientists working independently, highly reliable

Aperson with age is more likely to catch diseases that healthy people usually don’t catch. what are these infections called?

Why did adult crab numbers decline in he ecosystem, even though sea stars were still available?