What do birds have that distinguishes them from other organisms?

a. Four-chambered hearts

c. Amniotic eggs

b. Wings

d. Feathers

The histogram represents the distributions of boiling temperatures, in degrees Celsius, of tap water and a mixture of salt water.

True/false? T/f Loss of Habitat is the #1 cause of Species Endangerment and Species Extinction. T/f Invasive Species are the second leading cause of Species Extinction.

Red flowers (r) and white flower (w) are crossed to produce a pink flower (rw). what is the probability of a red flower, if 2 pink flowers are crossed?

Silicate minerals contain the elements silicon and oxygen. what contains only silicate materials

Describe how cell differentiation produces different types of cells in animals.

The process by which water moves across a cell membrane is called a. Osmosis b. Exocytosis c. Resolution d. Active transport

6. Allison ran a marathon for the first time. The next day she was stiff and store. Which of the following is a reasonable explanation of why her mucles were sore? a. Calvin Cycle c. alcohol fermentation b. Kreb's Cycle d. lactic acid fermentation

The age of the solar system is estimated by the dating of rocks. True or false

What are three of the excretory organs of the body

10. What is a major limiting biotic factor for animal succession in each stage? A) plant species B) sunlight
C) soil minerals D) vitamins