Which of the following rocks forms from shells and calcium carbonate?

limestone
halite
mudstone
coal

Environmental differences within ecosystems are generally caused by

Pls quickly! which of the following is true about the behavior of an organism? a. the behavior of an organism is influenced by both its heredity and it’s environment. b. the behavior of an organism is influenced only by the treats it inherits from its parents. c. the behavior of an organism is influenced only by the environment in which it lives in. d. the behavior of an organism is not influenced by either it’s heredity or its environment.

Were you able to observe the nucleolus in any of the cells if so which ones