1. marine scientists get information about aquatic populations from which of the following sources?
- news reports
- helicopter pilots
- commercial fishermen
- individuals on the beach

2. countershading is an example of
- a trait unique to sharks
- a technique used for hunting
- an adaption to the environment
- the issue created by light in the ocean

3. phytoplankton is the first link in the food chain.
- true
- false

Match each organ or function with its body system. produces urine large intestine ureters mouth filters blood absorbs nutrients from food

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.