What type of relationship is it where both species use the same limited resource, which negatively affects both species?

Hummingbirds feed on nectar from flowers. Flowers are pollinated by hummingbirds as they move from flower to flower. Does the hummingbird benefit from the flower’s actions?

Hummingbirds feed on nectar from flowers. Flowers are pollinated by hummingbirds as they move from flower to flower. Does the flower benefit from the hummingbird’s actions?

Hummingbirds feed on nectar from flowers. Flowers are pollinated by hummingbirds as they move from flower to flower. Is either harmed?

Hummingbirds feed on nectar from flowers. Flowers are pollinated by hummingbirds as they move from flower to flower. What kind of relationship is this?

Ticks live on dogs and feed on their blood and tissue. Dog gets skin irritation & pick up diseases carried by ticks. Does the tick benefit from the dog’s actions?

Ticks live on dogs and feed on their blood and tissue. Dog gets skin irritation & pick up diseases carried by ticks. Does the dog benefit from the tick’s actions?

Ticks live on dogs and feed on their blood and tissue. Dog gets skin irritation & pick up diseases carried by ticks. Is either harmed?

Which one is harmed?

Ticks live on dogs and feed on their blood and tissue. Dog gets skin irritation & pick up diseases carried by tick. What kind of relationship is this?

As buffalo graze they disturb insects in the grass causing them to jump out of the way, for example grasshoppers. Many bird species will follow the buffalo as they graze and will feed on the fleeing insects. Does the buffalo benefit from the bird’s actions?

As buffalo graze they disturb insects in the grass causing them to jump out of the way, for example grasshoppers. Many bird species will follow the buffalo as they graze and will feed on the fleeing insects. Does the bird benefit from the buffalo’s actions?

As buffalo graze they disturb insects in the grass causing them to jump out of the way, for example grasshoppers. Many bird species will follow the buffalo as they graze and will feed on the fleeing insects. Is either harmed?

As buffalo graze they disturb insects in the grass causing them to jump out of the way, for example grasshoppers. Many bird species will follow the buffalo as they graze and will feed on the fleeing insects. What kind of relationship is this?

Kudzu vines grow by climbing and wrapping around trees. Kudzu covered trees die as they are smothered and break under the weight of the growing kudzu vine. What type of relationship is this?

In Africa, lions and tigers compete for the same prey. They fill the same niche. What type of relationship is this?

Many species of bird build their nests in trees, the bird then has a safe place to raise young. The tree is neither harmed nor benefitted by the birds actions. What type of relationship is this?

Humans use horses for transportation and labor, in return the horses receive food, water, and shelter from the humans. What type of relationship is this?

In your opinion, which of the following is the easiest relationship to remember?