El aumento del oxígeno durante el Proterozoico produjo una gran extinción de los organismos anaerobios primitivos y una disminución del efecto invernadero que condujo a intensas glaciaciones en todo el planeta. ¿ Se puede afirmar que este fenómeno fue un proceso inducido por los seres vivos?

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. an incomplete dominance cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. purple offspring result. then, two of the purple offspring are crossed. according to the punnett square for this cross, how many of the offspring from the second cross will have a feather color that results from incomplete dominance? 1 in 4 2 in 4 3 in 4 4 in 4

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs

How does science influence the decisions made about social, economic, and political issues?