What did Gould and Eldridge infer about the pace and timing of evolutionary change? (5 points) a
Evolutionary change occurred gradually and constantly throughout time.

b
The pace of evolutionary change has slowed down over time and it only rarely occurs now.

c
Periods during which evolution occurred were always preceded by a catastrophe.

d
Long periods of stability were punctuated with periods of evolutionary change.

When species lose their habitats they may..

Mouse liver cells were homogenized and the homogenate subjected to equilibrium density-gradient centrifugation with sucrose gradients. fractions obtained from these gradients were assayed for marker molecules (i. e., molecules that are limited to specific organelles). the results of these assays are shown in the figure. the marker molecules have the following functions: cytochrome oxidase is an enzyme involved in the process by which atp is formed in the complete aerobic degradation of glucose or fatty acids; ribosomal rna forms part of the protein-synthesizing ribosomes; catalase catalyzes decomposition of hydrogen peroxide; acid phosphatase hydrolysis monophosphoric esters at acid ph; cytidylyltransferase is involved in phospholipid biosynthesis; and amino acid permease aids in transport of amino acids across membranes. a) name the marker molecule and give the number of the fraction that is most enriched for each of the following cell components: lysosomes; peroxisomes; mitochondria; plasma membrane; rough endoplasmic reticulum; smooth endoplasmic reticulum.

Which of the following types of rock would most likely contain a fossil? slate granite lava rock limestone