what genetic factor is most likely to result in the extinction of an entire species?
a lack of genetic variety in the population
a genetic defect in a few members of the population
a genetic resistance against many diseases
a lot of genetic variety in a population
a lack of genetic variety in the population
Over time, the climate of a region becomes cooler. How will this most likely affect the species living in that region?
a. Some species that already have or that develop cold-weather adaptations through natural selection will survive, while species without cold-weather adaptations may go extinct.
b. All of the current species living in the region will migrate to warmer areas, while species adapted to cold-weather climates will migrate into the region.
c. All of the current species living in the area will become extinct, and new species better adapted to the climate will form and populate the region.
d. All of the current species living in the area will become extinct, and new species better adapted to the climate will form and populate the region.
a. Some species that already have or that develop cold-weather adaptations through natural selection will survive, while species without cold-weather adaptations may go extinct.
Over time, the climate of a region becomes cooler. How will this most likely affect the species living in that region?
a. Some species that already have or that develop cold-weather adaptations through natural selection will survive, while species without cold-weather adaptations may go extinct.
b. All of the current species living in the region will migrate to warmer areas, while species adapted to cold-weather climates will migrate into the region.
c. All of the current species living in the area will become extinct, and new species better adapted to the climate will form and populate the region.
d. Most of the current species living in the area will develop beneficial mutations, which will lead to adaptations that help them survive in the new climate.
a. Some species that already have or that develop cold-weather adaptations through natural selection will survive, while species without cold-weather adaptations may go extinct.
results in many different types of organisms with different characteristics from their ancestors
A potato plant can reproduce asexually so that one potato can often give rise to many other potatoes. Strawberry plants can reproduce sexually.A potato plant puts a large amount of its energy into growing a tuber, which is the part that humans eat. The tuber can grow large and provide energy for the plant during the winter, or it can be used to grow new potato plants. A strawberry plant, on the other hand, puts much of its energy into growing flowers to attract insects that aid in pollination. After fertilization, the strawberry plant must then also grow seeds as well as fruit to attract animals that disperse the seeds.Based on this information, the asexually reproducing potato plant most likely devotes _______ to reproduction than the sexually reproducing strawberry plant.
more energy
fewer spores
less energy
more seeds
less energy
If there were no decomposers, which of the following would most likely happen?
Some plants might die due to a shortage of important nutrients.
The amount of dead plant and animal matter would decrease.
Plants and animals would remain living for a longer period of time.
Animals would start carrying out photosynthesis.