Efficiency is

a.

the percentage of energy lost to the surroundings as heat.

b.

the percentage of energy that is actually used to perform work.

c.

the entire amount of energy.

d.

the time it takes for half of the energy to be used.

A rejection of either science or scripture is usually due to a failure of understanding the

Which of the following differences between prokaryotic and eukaryotic cells is the greatest advantage to survival of eukaryotic cells? Eukaryotic cells can reproduce asexually in certain conditions.

One percent of the atmosphere is ___ gases.

What hormone is the adrenal medulla responsible for secreting? A. Gonadocorticoids B. Estrogen C. Epinephrine D. Androgen

Bacteria reproduce asexually, whereas most plants and animals reproduce sexually. Which is the better method?

Unlike minerals such as iron and calcium, protein is a macronutrient in the human diet. Why is protein a macronutrient?

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