Which protects a cell and forms it's boundary

In the theory of plate tectonics, various segments of Earths crust, called plates, move toward and away from each other.

The nonmetals include which of the following groups? Use the periodic table to answer the question. Check all that apply. halogens alkali metals lanthanides noble gases alkaline earth metals

Four unequal resistors are connected in a series circuit. Which one of the following statements is correct about this circuit? The total resistance is equal to average of the four resistors. The total resistance is less than the smallest resistor.

The oven draws 1100 W of power, and you have determined that it heats with an efficiency of 51%. Using this information, determine the time t it would take to bring 240 mL of water from 25°C to 100°C. Note that 4.

A 75.0-kg firefighter climbs a flight of stairs 28.0 m high. How much work does he do?

Discuss the use of headrests in the seats in a car in terms of newtons laws. Use terms and provide a comprehensive in depth answer with references.

Larry's gravitational potential energy is 1870Jas he sits 2.20 m above the ground in a sky diving airplane. What is Larry's gravitational potential energy when he begins tojump from the airplane at an altitude of 923m?

Which travels faster in helium, copper or lemonade?

In order for a boat to float, its weight must have a magnitude equal to the

Define the wavelength and frequency of a wave and explain how they are related.