Did the earth always have enough oxygen to support aerobic respiration? In your answer describe the important organism(s) involved in the evolution of photosynthesis. Why were these/this organism important to forming today's current environment. Use the following websites to support your answer. You must cite the websites posted below and any other sources that you use to answer the post using APA 7 rules. Articles to read:

https://evolution. berkeley. edu/evolibrary/news/170503_cyanobac teria (Links to an external site.)

https://www. scientificamerican. com/article/timeline-of-photosynthe sis-on-earth/

events in order:

1.       vishnu schist

2. zoroaster granite

3. bass limestone

4. hakatar   shale

5. igneous intrusion

6. shinumo quartzite

7. dox sandstone

8. tapeats limestone

9. bright angel shale

10. muav limestone

11. temple butte limestone

12. redwall limestone  

nonconformity

answer: the unkar group shows angular unconformity because the layers are turned at angle.

unconformity

answer: specifically the angular unconformity occurs between the cambrian and precambrian rocks. the dox sandstone, shinumo quartzite, hakatar shale, and bass limestone have been filled. an angular unconformity occurs between the cambrian and precambrian rocks. the dox sandstone, shinumo quartzite, hakatar shale, and bass limestone have been filled.

disconformity

answer: the disconformities aremarked irregular lines between the sedimentaryrocks layers.

the correct answer in apex is tissue development, i know because i just had this question

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called