Which of the following organisms first introduced oxygen into Earth's atmosphere?

A. cyanobacteria

B. methanogens

C. early protozoans

D. plants

E. green algae

Is a rare disorder in which the mechanism that inhibits the movement of the voluntary muscles fails, allowing the person to thrash around and even get up and act out nightmares?

During your last shift, 20 babies were born. 10 had blue eyes, and 10 had brown eyes. Remember genotypes are the two alleles given for each trait, written with a letter. For this activity B = brown eyes b = blue eyes.

Sugar is a simple molecule used by the plant for energy, starch is a complex sugar molecule used for long term energy storage. Predict which part of the might be used for starch storage and give an explanation of why in this location

What is the Function of DNA and RNA?

What organs does the pelvic region hold

Jane filled one transparent bottle and one brown bottle of the same capacity with pond water. She kept the first bottle in sunlight and the second in dark. After one hour she calculated the amount of oxygen present in both the bottles.

The kingdom contains all autotrophic organisms.

Bacteria cell traits

Which of the following is NOT a terrestrial biome? a desert a chaparral an estuary a tundra

Consider five independently assorting gene pairs, a/a, b/b, c/c, d/d and e/e, where each demonstrates complete dominance (a_, b_, c_, d_, and e_) and recessiveness (aa, bb, cc, dd and ee).