Facultative

The ability to regenerate limbs is facultative in certain species of lizards.

The use of a helmet is facultative for cyclists, but it is recommended for safety.

The presence of a tail in certain fish species is facultative.

The wearing of a mask is facultative in outdoor areas.

The ability to hibernate is facultative in some species of animals, as they can also remain active during the winter months.

The ability to swim is facultative for certain amphibians, as they can also walk on land.

Some bacteria can live in facultative conditions.

The facultative student decided to take an optional course in addition to their required classes.

Being a facultative carnivore, the raccoon's diet consists of both plant and animal matter.

The facultative anaerobe bacteria are able to grow in the presence or absence of oxygen.

Some fungi are facultative pathogens, which means they can cause disease only under certain circumstances.

The facultative anaerobe is capable of growing in the absence of oxygen, but it grows better in its presence.

The employee benefits were facultative and could be customized by the employees.

The facultative symbiont can have beneficial or harmful effects on its host depending on the circumstances.

The facultative decision to work from home or the office is up to the employee.

Some bacteria are facultative anaerobes, meaning they can survive in both aerobic and anaerobic conditions.

The facultative carnivore primarily feeds on plants, but can eat meat if needed.

The online course had facultative assignments that were not graded.

This facultative parasite can survive and reproduce both inside and outside its host.

The use of a phone is facultative during the meeting, so you can choose to either turn it off or keep it on silent mode.

This plant is facultative to certain conditions, like the amount of sunlight and moisture it receives.

The facultative exercise routine can be tailored to individual fitness goals.

The facultative traveler brought both warm and cool clothing to adapt to changing weather conditions.

Certain fish species are facultative air-breathers, meaning they can take in oxygen from both water and air.

The extra practice sessions were facultative for the sports team.

The study group sessions were facultative for the students.

The plant has a facultative mechanism to prevent water loss in dry conditions.

The facultative book club allowed members to choose which books they wanted to read.

The facultative parasite is able to survive outside its host for a limited period of time.

The facultative aerobe can survive in environments with or without oxygen.

Some bird species are facultative migrants, meaning they only migrate in certain years when environmental conditions are unfavorable.

Some animals are facultative carnivores and can survive on a plant-based diet.

The dress code was facultative for the wedding guests.

The facultative parasite can complete its lifecycle within a host or outside it.

The facultative nature of some plants allows them to grow in either wet or dry conditions.

Some fish are facultative air breathers, which allows them to survive in oxygen-poor waters.

The facultative bacteria in the soil can grow with or without oxygen.

Some plants are facultative, meaning they can tolerate a wide range of soil conditions.

The facultative parasite can either live independently or within a host organism.

The plant is facultative in its water needs and can survive with very little rainfall.

The facultative anaerobe can produce energy through both aerobic and anaerobic respiration.

The bacteria are facultative, meaning they can use a variety of organic compounds as a source of energy.

The facultative predator can obtain food through either hunting or scavenging.

The facultative symbiont can either benefit or harm its host organism.

The gym membership was facultative for the employees.

The presence of wings in birds is facultative for their survival.

The use of a textbook is facultative in this course, as all materials will be provided online.