Question

1 multiple choice 5 points
the accumulation of water vapor, carbon dioxide, and nitrogen in earths early atmosphere approximately 4 billion years ago resulted mainly from
outgassing from earths interior
radioactive decay
photosynthesis by the earliest land plants
convection currents in earths outer core
2 multiple choice 5 points
which of the following provides the most convincing evidence that two different animal species evolved from a common ancestor?
they live in similar environments.
they have similar adult body shapes.
they have similar methods of locomotion.
they show similar features in embryonic development.

Explanation:

1. For the first question:

• Outgassing from Earth's interior released gases like water vapor, carbon dioxide, and nitrogen to form the early atmosphere. Radioactive decay mainly relates to heat generation. Photosynthesis by earliest land plants came later. Convection currents in Earth's outer core are about magnetic field and heat transfer, not early atmosphere gas accumulation.

1. For the second question:

• Similar embryonic development features are strong evidence of a common ancestor as it shows shared developmental patterns from a common origin. Similar environments, adult body shapes, or locomotion methods can be due to convergent evolution (not common ancestry).

Answer:

1. outgassing from Earth’s interior
2. They show similar features in embryonic development.