The gaps of unjoined membrane through which small molecules exit and enter capillaries are called .
a) intercellular clefts.
b) pericytes.
c) sinusoids.
d) fenestrations.

A

Explanation:

1. A channel between two adjacent cells in known as an intercellular cleft.

2. And through these channels many molecules  can easily pass between cells.

3. Importance of Intercellular clefts:

i) It is very important in transportation of fluids and small solutes.  

ii) It contains gap junctions, tight junctions, desmosomes, and adheren proteins and these junctions help in regulate cell communication by signal transduction, surface receptors, or a chemogradient.

a) is the correct option

Explanation:

Capillaries are small exchange vessels (6-10 μ) composed of highly attenuated (very thin) endothelial cells surrounded by basement membrane − no smooth muscleThere are three structural classifications:Continuous (found in muscle, skin, lung, central nervous system) − basement membrane is continuous and intercellular clefts (between adjacent endothelial cells) are tight (i.e., have tight junctions); these capillaries have the lowest permeabilityFenestrated (found in exocrine glands, renal glomeruli, intestinal mucosa) − perforations (fenestrae) in endothelium result in relatively high (found in liver, spleen, bone marrow) − large intercellular gaps and gaps in basement membrane result in extremely high permeabilityLarge surface area and relatively high permeability (especially at intercellular clefts) to fluid and macromolecules make capillaries the primary site of exchange for fluid, electrolytes, gases, and macromolecules

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem