Chicken, fish, dogs and cats

1. Examples of variation found in the chicken, among others such as the following, except ...
a. reproduction
b. form part
c. marking
d. body size.

Answer: A.
discussion:
Variation is the differences that are owned by a living creature due to heredity and environmental factors. Examples of variations of coat color, beak shape, body size and resistance to disease. While reproducing the same way, the generative (mating) and fertilization occurs in the mother's body and then the embryo will grow in the egg.

2. One class of vertebrates that all members living in the water is ...
a. aves (birds)
b. amphibians (frogs)
c. Pisces (fish)
d. reptiles (reptiles).

Answer: C.
discussion:
All animals class pisces (fish) live in water and is shown on a respirator he had intended to live in the water are gills.

3. The stuff below is not used as the basis of the grouping of dogs and cats in one group, which is ...
a. the nature and characteristics of the eye
b. have four limbs
c. hairy
d. breastfeeding her child.

Answer: A.
discussion:
Basic grouping of dogs and cats are:
- = Number of limbs have four limbs (legs)
- Cover the surface of the body = hairy
- Have mammary glands = breastfeed
- = Canines as carnivores.
The nature and characteristics of the eye can not be used as the basis for grouping.