Some ponds fill in as debris and materials from once-living organisms fall to the bottom and build up. This is an example of WHO EVER ANSWERS FIRST GET BRAINLIEST BUT I NEED A EXPLANATION OF THE QUESTION

A. ecological change that takes place over hundreds of years.

B. an ecological change that takes place suddenly.

C. an ecological change in which a habitat is destroyed, but no new habitat is created.

Please help

How does the molecular clock work? a. it analyzes the brain functionality of two different species. b. it examines and compares the physical characteristics of two different species. c. it illustrates relationships between two different species. d. it compares the number of mutations that exist in the dna of two different species.

This part insulates the reaction chamber from the transfer of heat to or from the surrounding environment

20 point pls brianliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?