When does a comet's bright tail appear?

a.

when it nears the moon

b.

when it nears another comet

c.

when it collides with a planet

d.

when it nears the sun

In a single molecule of water, two hydrogen atoms are bounded to a single oxygen atom by what

What is transported in the xylem of a plant

What device can be used to make measurements globally? a. rain gauge b. buoy c. satellite d. thermometer i think the answer is c but im not sure

Which combination of alleles best describes a sex-linked trait? heterozygous alleles O homozygous alleles O alleles that are carried on X and Y chromosomes alleles that are carried on somatic cells

What is the difference between a negative and positive feed back loop

Which of the following statements are correct? Choose all that apply. Which of the following statements are correct? Choose all that apply. During transcription, active genes are brought to the periphery of a territory.

What happens during S phase? O A. Chromosomes are duplicated. O B. The cell splits in two. O C. DNA separates into two nuclei. O D. Cytoplasm is manufactured.

How does a salmon increase the chances of the survival of it species? a. it lays eggs b. it nurture young c it splits into two d it lays thousands eggs

What structure prevents food and liquids from entering the trachea?

Hormones are chemical molecules produced by endocrine glands. One such endocrine gland is the thyroid gland, which synthesizes the thyroid hormone, which in turn affects the heart muscles.