2. Many modern whales have a vestigial pelvis and femur, such as is shown in the diagram. What does this evidence suggest about ancestors of modern whales?

(A) (i) Describe TWO disadvantages of using Replicate Organism Detection And Counting (RODAC) plate during a surface swab. (ii) Explain TWO purposes of conducting a hand swab test. 12 m

Em 1950, a população de girafas numa região do Quénia era de 4600 indivíduos. Sabe-se que a taxa de decrescimento da população é \( 3,5 \% \) por década. Admitindo que a taxa de decrescimento se mantém constante a longo prazo, responda às questões que se seguem.

(C) State TWO ways in which fermentation process helps to improve [2 marks] quality of food products.

Glycerol a) Name the: (i) Process \( X \) (ii) Enzyme \( Y \) (iii) Molecule Z

(A) State ONE example of selective media that can be used to isolate [3 marks] EACH of the following microorganisms. (i) Gram positive bacteria. (ii) Staphylococci spp. (iii) Gram negative bacteria.