Which option describes energy being released as heat?

A - a Child shivering in the cold

B - Lions Sleeping after a big meal

C - A surfer on a Surfboard

D - A Baby Bird eating a Worm

Select all the correct answers. Which substances are made up of polymers? DNA a glass bottle ice crystals the proteins in hair rubber car tires

Which of the following metals is the most reactive and why? copper sodium magnesium zinc

A rock is found to contain 2.2 grams of uranium-235, a radioactive isotope. If the rock has undergone 2.75 half-lives, what was the original amount of uranium-235 in the rock and how old is the rock

What is the controlled variable for: 1. Does the amount of leaves on a tree affect how many birds build their nests in it? 2. Does the acid level of the lake affect how many fish live there?

Which two terms relate and why? Atom, Amu, Element

Evaporating water is an example of a physical change because

Given the number of mols equal to 1.28 and the molarity equal to 3.4M, determine the number of liters of solution

How many moles are in 36 g of Beryllium (Be) ? a. 0.25 mol b. 4.0 mol c. 45.0 mol d. 320 mol

Under which conditions can an eclipse occur? sun blocks Earth moon blocks the sun moon blocks Earth sun blocks the moon

In DNA, what base pairs with cytosine? A. adenine B. cytosine C. guanine D. thymine