This sequence of images shows the stages in which an ecosystem undergoes succession. Analyze what is happening in each of the pictures. Choose ALL the statements that accurately portray succession of this ecosystem.
A)
This shows primary succession because there is no existing soil in the
beginning.
B)
The pioneer species are most likely mosses and lichens with few soil
requirements.
This shows secondary succession because there is no existing soil in the
beginning.
D)
The pioneer species are usually annual plants, followed within a few years
by quickly growing grasses and weeds.
E)
Weathering and erosion breaks down the rock, allowing for the
establishment of soil before seeds are able to germinate.

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.

The location of the stomach is the diaprham

What type of organism is a one-celled organism that functions as a single unit? a. bi-celled b. single-celled c. pre-celled d. multi-celled