Blood vessels expand during hot weather and retract/ tighten in cold weather
The answer is: <span>larger horses have longer legs.
</span>The ancestors of horses lived in the forest, where they could hide from the predators. But, with the first steppes, they could be spotted by the predators. Horses had to adapt in order to survive. Thus, their legs became longer through time so horses could run faster to escape predators.<span>
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Make/produce and secrete hormones
Sounds like ADD (<span>Attention-Deficit Disorder).</span>
Answer:
The five types of interactions between species are
1) Competition: In such a type of interaction, organisms interact by competing for resources such as water, food resources, shelter etc.
2) Predation: In such a type of interaction, organisms of a species known as predators feed on organisms of the other species known as prey. For example, a lion feeding on a deer.
3) Commensalism: In such a type of interaction, an organism of a species benefits from the other organisms and the other organisms neither gains benefit nor loss. For example, Tree frogs using plants for protecting themselves from predators.
4) Mutualism: In this type of interaction, both the organisms of different species gain benefit from each other. For example, insects carry pollen when they move from one plant to another and in turn they use plant as a source of food.
5) Parasitism: It is a type of interaction in which one organism benefits whereas the other one is harmed. For example, Malaria is caused by anopheles mosquito feeding on the blood of humans.
