The answer is <span>bird droppings that contain seeds from a different location.
</span><span>Gene flow includes a transfer of alleles from one population to another. So imagine a population of plant A on location 1 and another population of plant A on location 2. They cannot interchange their genes. But if birds drop seeds from location 1 and those seeds get to location 2, gene flow may occur.</span>
Oxygen is a small molecule and it's nonpolar, so it easily passes through a cell membrane. Carbon dioxide, the byproduct of cell respiration, is small enough to readily diffuse out of a cell. Small uncharged lipid molecules can pass through the lipid innards of the membrane.
A mushroom-shaped landform
consisting of a column of less resistant rock supporting a broader extent of
wind-resistant rock is termed a yardang. Yardangs form in environments where
prevailing winds are strong and move in a single direction. Yardangs occur in
various deserts of the world such as the Turkistan and the Mojave deserts.
A crystals shape is determined by the arrangement of the atoms or molecules inside the crystal.
