the slash and burn system of deforestation reduces the number of oxygen producing and puts more carbon in the air

Fish are thought to have descended from ostracoderms.

Upturned Face by Stephen Crane (excerpt)

Read the excerpt about two men trying to bury a dead soldier right in the middle of a battle.

"Yes," said Lean. The two privates stood waiting, bent over their implements. "I suppose," said Lean, "it would be better if we laid him in ourselves."

"Yes," said the adjutant. Then apparently remembering that he had made Lean search the body, he stooped with great fortitude and took hold of the dead officer's clothing. Lean joined him. Both were particular that their fingers should not feel the corpse. They tugged away; the corpse lifted, heaved, toppled, flopped into the grave, and the two officers, straightening, looked again at each other—they were always looking at each other. They sighed with relief.

The adjutant said, "I suppose we should—we should say something. Do you know the service, Tim?"

"They don't read the service until the grave is filled in," said Lean, pressing his lips to an academic expression.

"Don't they?" said the adjutant, shocked that he had made the mistake.

"Oh, well," he cried, suddenly, "let us—let us say something—while he can hear us."

"All right," said Lean. "Do you know the service?"

"I can't remember a line of it," said the adjutant.

Lean was extremely dubious. "I can repeat two lines, but—"

"Well, do it," said the adjutant. "Go as far as you can. That's better than nothing. And the beasts have got our range exactly."

Lean looked at his two men. "Attention," he barked. The privates came to attention with a click, looking much aggrieved. The adjutant lowered his helmet to his knee. Lean, bareheaded, he stood over the grave. The Rostina sharpshooters fired briskly.

What are the tone and mood of the passage?
A. The tone of the story is serious and the mood is one of anticipation.
B. The tone of the story is neutral and the mood is one of desperation.
C. The tone of the story is somewhat hopeful and the mood is cheerful.
D. The tone of the story is sympathetic and the mood is sorrowful.
E. The tone of the story is somewhat humorous and the mood is uneasy.

An example of something that is biodegradable is

Which of the following statements is a hypothesis?A) There are more calories in french fries than in colas.
B) If a student buys a meal plan, he or she will eat more vegetables.
C) Ginny gained 5 lbs her freshman year.
D) I like my biology class better than my other classes.
E) Blake failed the test.

At one time, dinosaurs lived on Earth. Today they are extinct. This relates to _____.A. microevolution
B. both macroevolution and microevolution
C. macroevolution

Which statement describes the relationship between chromosomes, genes, and alleles? A. Alleles transfer genes to the appropriate location within a chromosome. B. Alleles are sites on a chromosome that genes bind to. C. Chromosome's have mutated parts called genes. These mutations are caused by alleles. D. A chromosome's specific section is called a gene. Alleles are variations of a gene.