Which describes step three of a muscle contraction?

A: The sarcomere lengthens.

B: The space between sarcomeres increases.

C: Actin and myosin are partially overlapped.

D: Actin and myosin are completely overlapped.

Stress can affect the circulatory system by causing headaches. True or False

What are two main requirements for natural selection to occur?

What determines how many covalent bonds two atoms can make?

Which scientist first said that planets travel in fixed paths or orbits A) Kepler B) Ptolemy C) Galileo D) Copernicus

Temperate marine climates are normally: a.) hot b.) cool to warm c.) cold d.) warm to hot

What are reasons scientists use models? To study objects far away To study objects too large To study objects too small. To study objects easily found in a lab. To study events that take place over long periods of time.

1. true false Carbon atoms form the building blocks of most living things.

Inhibiting enzymes involved in cell wall synthesis leads to which of the following? A) cell death by osmotic lysisB) a reduction in protein synthesisC) the incomplete synthesis of the bacterial cell wallD) a reduction in the amount of usable energy

In the 20th century where did the most ecologically destructive oil spill in the US

Which of the activities listed below are functions of the Lymphatic System? 1 transports lipids to the blood 2 transports lipid-soluble vitamins to the blood 3 drains excess interstitial fluid from tissue spaces and returns it to the blood 4