What type of bonds/interactions occur between the hydrocarbon tails of two adjacent phospholipid molecules within a plasma membrane?

What is the difference between an igneous, sedimentary and metamorphic rock

Number and variety of living organism; includes genetic, species, and ecological types

The many stone tools, fragmentary animal bones, and teeth found at gran dolina, spain, indicate that hominids there? a. processed and consumed animals and other hominids. b. did not differ appreciably from earlier asian homo erectus. c. were similar to later homo sapiens. d. none of the above