The highest level of certainty a scientific explanation can attain is a(n) ___________.
a. theory
b. hypothesis
c. inference
d. observation
e. study
Ans: a. theory
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The hormone that is the basis of most pregnancy tests is
A. follicle-stimulating hormone. B. luteinizing hormone. C. human chorionic gonadotropin. D. estrogen. E. progesterone.
The organ system that regulates and integrates body functions via hormones
A) Muscular
G) Respiratory
B) Reproductive
H) Skeletal
C) Digestive
I) Nervous
D) Cardiovascular
J) Endocrine
E) Integumentary
K) Lymphatic
F) Urinary
What is a disadvantage to having an
exoskeleton?
a. muscles do not work effectively b. the body tissues are unprotected by it c. it does not grow with the animal d. it prevents the possibility of flying e. more than one of these is a disadvantage to an exoskeleton
Which of the following is neither a fruit nor a reproductive part of a plant?
A. broccoli B. celery stalk C. walnut D. tomato E. corn