La reproducción de los seres vivos es un proceso biológico mediante el cual los organismos crean descendencia, lo cual es de vital importancia para perpetuar las especies. Se reconocen dos tipos de reproducción: la reproducción sexual y la reproducción asexual, que a su vez se subdividen en otros.
Answer is D. The phosphate group of membrane lipids are negatively charged.
The cell or plasma membrane is a bilayer of phospholipids. The two phospholipids layers are opposite to each other. Each phospholipid molecule consists of a phosphate group and a lipid. The phosphate form inner and outer layers of hydorphilic and are negatively charged 'heads' and lipid forms the tail, hydrophobic and non-polar. Since phosphate is negatively charged it repels negatively charged molecules and do allow them to pass through it.
The Robinson projection map is considered very useful because most distances, sizes, and shapes are accurate.
Answer:
Small hydrophobic molecules and gases like oxygen and carbon dioxide cross membranes rapidly. Small polar molecules, such as water and ethanol, can also pass through membranes, but they do so more slowly.
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Explanation:
