Which kind of worm has a closed circulatory system?

a planarian

b fluke

c pinworm

d an earthworm

Which of the following may be associated with the collision of two sections of continental crust? A. hot-spot volcanoes B. earthquakes and a mountain rages C. earthquakes, volcanoes, and trenches D. trenches and earthquakes

Light and sound waves are A. both particles and wave, but sound waves are longitudinal waves that can travel through a vacuum B. both longitudinal waves, but one is electromagnetic (light), while the other is not C.

Raisins were soaked in distilled water overnight and then observed. what would you predict to happen?

What does food pass through in order to get from the stomach to the small intestine?

Process a. plants absorb carbon dioxide process b. animals dig tunnels in the soil process c. water combines with gases to form acid rain process d.

Phytoplankton are essential because they produce which of the following? A. oxygen B. nitrogen C. sulfur D. phosphorus

Which of the following processes is necessary for cellular reproduction and the repair of tissues? A catabolism B excretion C meiosis D mitosis

Describe three abiotic factors that influence this ecosystem

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

1. Nguyen's central idea about dams is a. they impact communities in negative ways as well as positive ways. b. they are worthy of Alvarado's praise because of their environmental impact. C, they are not worth building, d.