A cell membrane of living cells is formed by a double layer of phospholipids. Which is true about the head and tails of the individual phospholipids? a. The tails are hydrophilic and the head is hydrophobic.
b. The head is hydrophilic and the tails are hydrophobic.
c. Both the head and tails are hydrophilic.
d. Both the head and tails are hydrophobic.

Embryos of different species look very similar, which shows that the organisms share a ancestor.

Achemist wants to extract copper metal from copper chloride solution. the chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (ii) chloride. a single replacement reaction takes place. (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction? a) approximately 0.36 grams, because copper (ii) chloride acts as a limiting reactant b) approximately 1.8 grams, because copper (ii) chloride acts as a limiting reactant c) approximately 0.36 grams, because aluminum acts as a limiting reactant d) approximately 1.8 grams, because aluminum acts as a limiting reactant

Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean