Which statements describe effects of large asteroid and comet impacts? check all that apply.
1. they may cause extinction.
2. they may cause small craters on earth’s surface.
3. they may cause changes limited to within the crater.
4. they may kick up dust and pollute earth’s atmosphere.
5. they may cause organisms and populations to die.

Acladogram is a branching diagram that represents suggested evolutionary relationships among organisms based on the presence of unique traits. a scientist discovers a new organism that lacks limbs and does not have a true backbone. the organism lays eggs to produce offspring and has a cartilage-like rod known as a notochord running along its dorsal surface. on the cladogram below, select the species to which the newly discovered organism is most closely related.

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.

Has anyone taken the genetics unit test in connexus? not looking for answers, just a little bit what to expect and some with studying.