Put the steps of muscle contraction in order from first (1) to last (5).

The sarcomere shortens.

Calcium ions are released by a nerve cell.

The sarcomere is relaxed.

Actin and myosin overlap completely.

Actin and myosin are activated.

Which system creates blood cells?

Two plant species found in a dry region of the western United States exhibit vastly different abilities to survive. Species A has very slow stem growth and few leaves but is very abundant.

Which weighs more (in grams), a mole of gold (Au) or a mole of bismuth (Bi) ? Explain you answer

Diference between aerobic and anaerobic respiration in terms of energy production and location.

Which reproduction requires both parents

Which hormone causes the regrowth of the endometrial lining of the uterus? testosterone estrogen GnRH progesterone

78.44 meters to centimeters

Which of these is an example of an endoparasitic relationship? O A. A tapeworm living in an animal's intestine O B. A rabbit eating lettuce in a farmer's garden O C. A tick living in an animal's fur coat O D. A snake eating a mouse in a cornfield

Why is the presence of organic material in the soil important? A) It wards away plant eating organisms. B) It increases plant growth. C) It increases sunlight absorption. D) It increases water absorption.

Which derived characteristic is shared by at least four organisms? Large brain Lungs Mammary glands Placenta