40 points a scientist is observing an invertebrate animal that she collected in shallow salt water. the animal has a hollow central cavity and a gut. which animal is the scientist most likely observing? a cnidarian, because it has a gut a cnidarian, because it was collected in shallow salt water a sponge, because it has tissue layers a sponge, because it is an invertebrate

Where can you find prokaryotic and eukaryotic cells?

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?

Me brainliest 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?