Review: singular / plural forms (Latin / Greek scientific words)

Organize these options into the right categories

Groups:

(a) Singular form

,

(b) Plural form

,

(c) Singular / plural form

• radiuses

• radii

• diagnosis

• formulas

• crises

• species

• bacterium

• series

• alga

• stimuli

• spectrum

• algae

• antenna

• radius

• bacteria

• medium

• matrix

• matrices

• spectra

a)  The design of the mechanism must meet five ​ (a)   . The first ​ (b)   is safety.

• criteria
• criterion

A total eclipse of the sun is an impressive ​ (a)   .

Of all the celestial ​ (b)   , a total eclipse of the sun is the most impressive.

• phenomenon
• phenomena

a)  Scientists aim to discover meaningful ​ (a)   that accurately describe experimental data.

• formulae
• formula

A ​ (a)   , as related to genomics, is the membrane-enclosed organelle within a cell that contains the chromosomes.

• nucleus
• nuclei
• nucleuses

Sensory over-responsivity (SOR) is a common condition in autism spectrum disorders (ASD) that is associated with greater social impairment. However, the mechanisms through which sensory ​ (a)   may affect social functioning are not well understood.

• stimuli
• stimulus

Our results confirmed ​ ​ (a)   hypothesis.

• this
• these

From 1990 to 2000, pharmaceutical R&D spending worldwide rose from approximately $10 billion to more than $25 billion, but the number of new bio-pharmaceuticals has not kept pace. While a lot of ​ (a)   exist regarding why this has occurred, few ​ (b)   have been undertaken.

• analyses
• analysis
• hypotheses
• hypothesis