What caused the oxygen levels in Earth’s atmosphere to increase during the Precambrian time? Choose the correct answer. Land plants evolved and released oxygen as they grew.

The chemical weathering of granite released large quantities of oxygen.

Oxygen dissolved in the ocean was released by osmosis into the atmosphere.

Cyanobacteria consumed carbon dioxide and released oxygen as a waste product.

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.

Plz ! having a smooth seeds is the dominant trait. having wrinkled seeds is a recessive trait. the offspring of two plants with smooth seeds, a. must have smooth seeds. b. may have smooth or wrinkled seeds. c. must have wrinkled seeds. d. have a 25% change of having smooth seeds.

Rarefaction is used for which of the following? a. creating a representative sample b. studying how disease impacts populations c. rediscovering species thought to be instinct d. determining which sea creatures live in an area