A small plastic cup is floating in a pan of water. Inside the cup is one quarter. For an experiment, students take turns adding quarters to the cup one quarter at a time. Making observations after each quarter is added to the cup, the students will notice something about the water level in the pan. What do they notice about the water level? A) The cup will sink.
B) The level will go up.
C) The level will go down.
D) The level will remain the same.

humans can cause extinction of a species through overharvesting, pollution, habitat destruction, introduction of invasive species (such as new predators and food competitors), overhunting, and other influences. explosive, unsustainable human population growth is an essential cause of the extinction crisis.

explanation:

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if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?