Please help if you can <3

Need will mark ! which features are created by groundwater erosion and deposition? check all that apply. a. stalagmitesb. sinkholesc. rillsd. stalactites e. gullies f. rivers

Are the earth's ocean floor and continents the same age geologically? why or why not?

Select the correct answer. what is the observable characteristic of a person called? o a. genotypephenotypeoc. alleleo d. gene