Living Cells are not essential for--
A: Evaporation
B: Transpiration
C: Guttation
D: All of these
1. Today our ecosystems are affected by changing weather patterns caused mainly by the
A: melting polar ice.
B: increase in temperature.
C: increase in greenhouse gases.
D: increase in global industrial waste.
2. A homozygous trait is defined as
A: the appearance of an organism.
B: an organism that carries two identical alleles.
C: an organism that carries two different alleles.
D: the two letters that make up the organism�s genes.
3. A cross between two traits was made using a punnett square as given below.
R r
R RR A
r Rr B
The genes for A and B are
A: RR, rr.
B: Rr, Rr.
C: Rr, rr.
D: RR, Rr.