The functional unit of a muscle is the

(A) actin.

(B) myosin.

(C) Z line.

(D) sarcomere.

Suppose that you are conducting a field experiment with plants. You are testing the hypothesis that plants grow much faster when mulch covers the soil. Plan how you would conduct the experiment. Then plan how you would repeat it.

True or false? Single-stranded DNA molecules are said to be antiparallel when they are lined up next to each other but oriented in opposite directions.

DDT is a synthetic compound commonly used as an insecticide. It was used to control mosquito species that commonly spread diseases like malaria. The data show the percent resistance for three species of mosquitoes over three decades.

Which is a result of selective breeding? a A bird that catches prey with its beak. b Large seedless watermelons that consumers demand. c Oranges that are all different sizes and colors. d An insect that can carry ten times its body weight.

Which of the following is true about the cells in a multicellular organism? 1) the cells contain different genes and therefor express different genes. 2) the cells contain different genes, so they express only the genes they have in common.

Spider monkeys in Costa Rica live in the rainforest, where they eat fruit and nuts from big forest trees. The trees also protect them from predators like jaguars and large snakes. The trees are the spider monkey's.

Which key difference do experiments have that correlation studies do not have?

What are the two major components of a carbon footprint and Why?

Match the following vocabulary words with the correct definitions. 1. Place where something is located. amber 2. A mark that is made by pressure. mineral 3. Fossilized sap of trees. site 4. Element or chemical substance from the ground. identify 5.

Mitosis itself occurs in how many stages