Oxygen was absent in Earth's early atmosphere. When oxygen levels rose in the atmosphere, what likely occurred? A. Some life went extinct.
B. Some life survived in a few habitats without oxygen. C. All of the above.
D. Some life survived because it had adaptations and/or evolved metabolism that used oxygen.

Classify the descriptions and examples as endocrine or neural control

Scenario #2 in 2001, a population of 2,500 poison dart frogs lived in the amazon rain forest. due to increased deforestation, the population dwindled to 25 frogs in 2019. new government regulations were enacted in 2022, successfully putting an end to the deforestation of the amazon rain forest. once deforestation was stopped, the poison dart frog population was able to recover. by 2050, the population reached 8,000 frogs, of that population, 20 are homozygous recessive for being spotted (ss genotype). q2- ? q- p- p2- 2pq-

Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. which punnett square represents the correct way to set up the cross rryy  ´  rryy?