facultative

It introduced the facultative referendum for laws at the federal level.

Others are facultative, meaning that they can, but do not have to live with the other organism.

It comprises eight grades, the first of which is facultative.

This is 'facultative', which means they may or may not do it.

He refers to the former as a "facultative" relationship.

Those that live on flowers are normally facultative predators.

It was probably quadrupedal, but may have been a facultative biped.

In 1954, the company created the first professional casualty facultative reinsurance department.

An example of a facultative psychological adaptation may be adult attachment style.

It is usually a facultative characteristic and affects only a proportion of the worm population.

Facultative anaerobes can use oxygen when it is present.

Biological activity within a facultative lagoon varies directly with temperature.

Facultative parthenogenesis is believed to be a response to a lack of a viable male.

Facultative adaptations express themselves differently depending on input from the environment.

It would also have been capable of galloping and facultative bipedalism.

Some associations are facultative, benefiting one or both participants but not being necessary to their survival.

In many cases, facultative bipedality is a function of speed.

It is a facultative anaerobe that can infect humans and other animals.

It is also used in the wastewater industry for facultative microorganism respiration.

It is the primary facultative anaerobe of the human gastrointestinal tract.

Facultative reinsurance can be written on either a quota share or excess of loss basis.

Facultative anaerobes can use oxygen, but also have anaerobic methods of energy production.

This association may be either facultative or obligate.

Plants that fall into this category is known as facultative rheophytes.

The pupae have a facultative diapause of at least four years.