You wish to study the impact of synthetic estrogen like hormones on the health of whales (and people). Select the organism from the table below that would be best to use in your research. Why did you select this organism? Model Organism Characteristics

YeastSingle celled, eukaryotic (contains a nucleus)
Fruit flyMulticellular, eukaryotic, invertebrate, arthropod
ZebrafishMulticellular, eukaryotic, vertebrate, fish
MouseMulticellular, eukaryotic, vertebrate, mammal

Fruit flies, because they are multicellular like whales
Mouse, because they are mammals like whales
Yeast, because they are eukaryotic like whales
Zebrafish, because they live in the water like whales

Because humans are multicellular, eukaryotic (contains a nucleus), vertebrates, and mammals, the best organism to test the synthetic hormones on would be a mouse.

Explanation:

Humans and whales are multicellular (they have many cells) and their cells are eukaryotic (contain a nucleus). They also have a backbone (spinal column), which makes them a vertebrate. Finally, all humans and whales are mammals. Therefore, to get the best results, the testing should be performed on a mouse.

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.