Considering that millions of species have lived on earth why are there relatively few fossils

Psychological and physiological dependence on a drug is called tolerance. a. True b. False

Discuss how a coal seam might be used as a key bed.

How would the contractile vacuole of a freshwater amoeba respond if the organism was placed in seawater? A) with more contractions B) with fewer contractions C) the contractions would suddenly cease D) with the same frequency of contractions

Assess the following statements, and classify them according to whether they refer to viral particles or living cells.

Suppose that tomatoes with the RR genotype are red and those with rr are green. Assuming that this reflects conventional genetics shorthand of upper - and lowercase letters, which situation is true? A.

What is the dependent variable? Also what is the Testing Variable.

Statistics about the climate in a tundra ecosystem were collected for 30 years. which hypothesis about a population of caribou could be made based on the climate data collected? a. caribou calf survival is directly related to annual rainfall amounts.

Since plant cells do not have centrioles, how do they make spindle fibers during mitosis?

Plants use sunlight to produce some ATP during photosynthesis. How do plants produce ATP when the Sun is not out? a. Plants are secondary consumers. b. Plants also use cellular respiration. c. Plants extract ATP from the stars. d.

Describe 4 ways that we know the global climate is changing