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

A. cyanobacteria

B. methanogens

C. early protozoans

D. plants

E. green algae

What products would result from the complete hydrolysis of gly-ala-ser?

Which statement best explains why Earth's outer core is in liquid form? The iron-nickel alloy melts due to hot temperatures. The outer core has a tarry consistency. This region is less dense when compared to the mantle.

A volcanic eruption can cause a primary disturbance in an ecosystem. What is a primary disturbance

Students planted three bean seeds. after several days, they observed that the seeds' roots were growing downward into the soil. which type of topism were the roots displaying?

The maturation of a cell for a specific function known as

Energy drinks have become increasingly popular. Somebody's trying to contain large amounts of caffeine which is known to increase heart rate in most individuals. This effect on the heart rate can be Dangerous because it can lead to

Which statement describes an activity of a decomposer? A) a mushroom digests and absorbs nutrients from organic matter?

How does science works

Of the following, which is NOT characteristic of vascular plants? A cell walls B roots C Limited range in height D xylem

What causes the phases of the moon?