- There is evidence the continent of Antarctica once had a tropical climate. However, Antarctica moved southward to its current location over the South Pole of Earth after the breakup of the super continent Pangaea. This movement caused which ecological changes in Antarctica?
- pour connaitre la quantité de matière dans une masse d'échantillon
- The breakup of Pangaea had which effect on the subsequent history of animal speciation?
- The pictures show two different ferns that lived millions of years apart. The early fern is extinct but is drawn based on fossil evidence. Scientific data reveals that the early fern is an ancestor of the modern fern. Which statement best explains why the fern changed over time?
- Students were investigating the effect of antibiotics on bacteria. The students exposed a colony of bacteria to an antibiotic and 10% of the bacteria survived. Over time, the surviving bacteria multiplied. When the second generation of bacteria was exposed to the same antibiotic, 85% survived. Which statement best explains the results of this investigation?
- What can genetic drift lead to if there is no variation for naturalselection to occur?
- which is most likely responsible for the chinch bugs' ability to survive repeated exposure to insecticides
- The ichthyornis was a type of bird that lived over 65 million years ago. It lived near the sea and hunted for fishover the water. Fossils have been found in Kansas, many miles from the present-day ocean. Which cause ofextinction is most likely to be found in the fossil record along with ichthyornis fossils?
- The fur color of a bear varies with its environment. Polar bears found in the Arctic have white fur, while black bears found in Pennsylvania have dark fur. Which best describes the variation of fur color amongst the bear species?
- The beaks of honeycreeper birds of the Hawaiian Islands have adapted and changed compared to the beaksof honeycreepers found in the continental United States. Each species of honeycreeper is adapted to eatinga particular type of food. Which of these honeycreepers would be best suited to have nectar as its main foodsource?
- What 3 bases are found in all tRNA molecules at the 3' end?
- Which seed is most likely to be carried on the feet of animals?
- A particular environment has a dry, sunny climate. The daytime temperatures in this region are high, while the nighttime temperatures are low. Little rain falls during the year and the sandy soil retains little moisture. Which adaptations would be most helpful to plants living in this environment?
- In Peru, fossils of an unknown species of penguin were recently discovered. The species stood about 1.5 meters tall and is the third largest penguin known. The diagram shows the skull of a modern penguin in Peru and the skull of the newly discovered species. Which can most likely be inferred about the two penguin species from this fossil evidence?
- What must be present in the tRNA molecule in order for it to function properly?
- Small mammals have many adaptations that keep them warm in winter. Which would not help conserve heat?
- What is the process of changing shape and form, often found ininsects, known as?
- Which of the following describes the body plan where the parts are organized in a circle around an axis?
- Individuals among a species of ground beetle show equal variation in color from light brown to dark brown. This species is introduced to an environment with dark soil. Which diagram is most likely the best prediction of ground beetle color variation several years later?
- A mild environment begins to experience a gradual decrease in temperature resulting in much colderwinters than previous years. Which variation would most likely be selected for in an organism that lives inthis environment?