What is a vestigial structure? Question 3 options:

Structures that appear to have no function for the organism but probably had a function in an ancestral organism

Structures that are vital to the survival of a species

Structures that look similar to another structure if a different organism

Structures that all living organism share regardless of their ancestry

Number and variety of living organism; includes genetic, species, and ecological types

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?

What two factors does carrying capacity compare? population size and resource use population growth and resource availability resource use and time population size and time