Classify the following as either a specific or a nonspecific defense of the body's immune system. • skin

• macrophages

• bacteria • mucous

• fever

• B cells • T cells

• antibodies

Can you identify the class of organic molecule to which these molecular structures and examples belong? Part A Sort these items into the appropriate bins.

How might the fish in a lake be affected if large amounts of hot water from a power plant or factor were released into the lake?

Generation-to-generation change in the allele frequencies in a population is

Results or conclusion of the bubble model

Which statements best describe natural selection? Check all that apply. Populations must have genetic variation. Genetic mutations do not produce advantageous traits. Natural selection occurs when the environment changes.

What problem is most directly caused by burning waste? A. Groundwater pollution B. Air pollution C. Lake pollution D. Ocean pollution

How are currents in the Pacific Ocean affected by El Niño? Currents travel more slowly. Rip currents are frequently formed. All currents become deep ocean currents. Warm water moves to the east instead of to the west.

Which statement accurately describes Darwin's experience on the Beagle? A. He had a eureka moment and understood how species evolve. B. He recognized the significance of each species he observed. C.

How are hydrogen bonds different from covalent bonds? A) The atoms in hydrogen bonds have valence electrons B) The compounds that result from hydrogen bonds contains carbon C) Covalent bonds are organic D) Hydrogen bonds are weaker than covalent

What would your superhero element look like? iron man.