Sentence examples for species difficult to from inspiring English sources

Some species difficult to separate; green-flowered species doubtfully distinct from P. unalascensis.

Many annual species difficult to separate; observation of nutlets and hairs requires magnification at 20X.

Oligonucleotide probes provide rapid, easy identification of species difficult to identify by more traditional means, e.g. light microscopy.

This fact makes some of the larger species difficult to keep in aquaria since they are capable of breaking the glass with one quick blow.

"[They] permit us to observe the diurnal, nocturnal, and discreet species difficult to [find through] direct observation like lesula, Congo peafowl, elephants and also dangerous species like leopard.

In contrast, the 'slimy' consistency of the Planktothrix sp. (CAWBG59), made this species difficult to handle, whereas Ph. autumnale (CAWBG26) form cohesive dense mats, ideal for simple harvesting.

Even though species- or group-specific primers that can be used for samples containing multiple species are difficult to design, species- or group-specific primers are a practical solution for quantification in the current era.

But their very size, longevity, and genome complexity makes these species difficult subjects to study and breed.

But indirect trophic effects, where one species changes another species in some way that benefits a third species, are difficult to detect and to document.

A lack of published growth models for indigenous New Zealand forest species means that the sustainable management of these species are difficult to achieve at present.

The genus Amphiprion includes several species with very similar coloration and overlapping variation at otherwise diagnostic morphological characters that make species very difficult to differentiate [33].