Affiliate Marketing Secrets

I read the following sentences in a medical paper:
“These cells were used to derive S1 cells that have a number of mutations, but when injected into NOD/SCID mice are nonmalignant; when cultured in 3D, laminin-rich basement membrane gels that recapitulate the normal niche, they ‘growth-arrest’ and form structural mimics of mammary acini found in vivo.
“These cells form nonpolarized, disorganized masses in 3D cultures that do not ‘growth-arrest’.
I don’t get what ‘growth-arrest’ means. Can anybody help me?

I read the following sentences in a medical paper:
“These cells were used to derive S1 cells that have a number of mutations, but when injected into NOD/SCID mice are nonmalignant; when cultured in 3D, laminin-rich basement membrane gels that recapitulate the normal niche, they ‘growth-arrest’ and form structural mimics of mammary acini found in vivo.
“These cells form nonpolarized, disorganized masses in 3D cultures that do not ‘growth-arrest’.
I don’t get what ‘growth-arrest’ means. Can anybody help me?

I read the following sentences in a medical paper:
“These cells were used to derive S1 cells that have a number of mutations, but when injected into NOD/SCID mice are nonmalignant; when cultured in 3D, laminin-rich basement membrane gels that recapitulate the normal niche, they ‘growth-arrest’ and form structural mimics of mammary acini found in vivo.
“These cells form nonpolarized, disorganized masses in 3D cultures that do not ‘growth-arrest’.
I don’t get what ‘growth-arrest’ means. Can anybody help me?

the choices are:
a.different species can share the same niche in the same habitat
b.no two species can share the same niche in the same habitat
c.two species in the same habitat have to share a niche to survive
d.different species can occupy niches that are very similar
which sentences are true???