What is the function of a top predator in an ecosystem

Scientists observed a rock stratum with fossil. if mollusks evolved before arthropod, where will their fossils be found.

Which phases do not always fill their containers? select all that apply a. solid b. liquid c. gas

Layer r contains a well-known index fossil that is 100 million years old. based on this information and the principle of superposition, a. layers t and m are older than 100 million years, and layers x and g are younger than 100 million years. b. layers t, m, x, and g are all older than 100 million years. c. layers t and m are younger than 100 million years, and layers x and g are older than 100 million years.