1. 1. The behaviors and physical characteristics of species that allow them to live successfully in their environments are called?
Habitats
Limiting factors
Biotic factors
adaptations

2. 2. If all the members of a species disappear from earth, the species is said to be
A. Extinct
B. Endangered
C. Threatened
D. Limited

3. 3. The process by which an organism’s internal environment is kept stable in spite of changes in the external environment is called
A. Digestion
B. Homeostasis
C. Healing
D. Respiration

4. 4. Which of the following is an example of a predator adaptation?
A. A shark’s powerful jaws
B. A frog’s bright colors
C. A porcupine’s needles
D. A plant’s poisonous chemicals

5. 5. Read the selection. Then, use the chart and answer each question
5. Read the selection. Then, use the chart and answer each question. Use complete sentences.
The time needed for an embryo to develop inside its mother is called the gestation period. As you can see from the chart, the amount of time varies greatly.
Animal
Gestation Period
Dog
2 months
Lion
3 months
Seal
12 months
Giraffe
14 months
Rhinoceros
18 months
Elephant
22 months

6. A. Which animal has a gestation period of almost two years?
B. Which animal has the shortest gestation period?
C. How long is a giraffe’s gestation period?
D. How much longer is the gestation period of a seal than that of a lion?
E. The gestation period of a human is nine months. Which animals on the chart have a longer gestation period than a human?