johnkings140
06.07.2019 •
Biology
1. what allows things to enter and leave a cell and is the gate keeper?
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Ответ:
The cell membrane; which is "selectively permeable" .
Ответ:
Option B and option D.
Step-by-step explanation:
We know that a quadrilateral is a 2-dimensional closed shape that has four sides.
By definition the diagonals of a quadrilateral are the lines that connect two non-adjacent vertices.
The following quadrilaterals have diagonals that are perpendicular to each other (also known as perpendicular bisector diagonals), which means that they form four angles of 90 degrees (right angles): Rhombus and Square.
Therefore the answers are: the option B and the option D.