The list of elements that contains only metals is C. tin, copper, cesium.
There are so many examples for that in different areas, like biology experiment carried out in our lab recently.
Here's one link : https://www.creative-biogene.com/symbolsearch_CRE.html
Answer:
The relationship between the frog and the insects is a predator-prey relationship. If the number of frogs in the ecosystem decreased because of human activity, there's a possibly that the number of insects might increase.
Explanation:
In this controlled ecosystem, frogs naturally prey on insects. If there were to be less frogs in the ecosystem, the number of insects might increase because there are fewer frogs to hunt them.
Answer:
Nutrient-rich blood flows into the liver from the intestines through the hepatic portal vein.
