Several lines of evidence suggest that Mars once was habitable, and the Panspermia hypothesis states that life originated on Earth when it came from Mars on a meteorite. Imagine you are the lucky chief biologist on the first mission to Mars and discover what appear to be fossilized cells. You dutifully perform chemical analysis of the fossil. Which of the following would suggest that these were NOT, in fact, fossilized cells but non-organic structures?

a. Absence of (cellular) nuclei
b. Existence of RNA monomers but not DNA
c. The presence of equal quantities of L- and D- amino acids.
d. An organized, regular appearance

What are the headings of a data table

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area

Jason, a dog breeder, decides to mate a poodle with a golden labrador retriever. he wants to get puppies with the curly hair of the poodle and the color of the labrador. what concept is shown in this example? question 6 options: artificial selection adaptation evolution natural selection