In the past 400 years more than 1000 species have become extinct which is ____ times the fossil record
a. 1 -- 10
b. 5 -- 10
c. 10 -- 100
d. 100 -- 1000
e. none of these are correct
Answer: d. 100 -- 1000
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Prosthecae are an adaptation for
A) anaerobic growth. B) cell differentiation under harsh conditions. C) nitrogen fixation. D) low nutrient aquatic environments.
During animal development, a fertilized egg divides to form a ball of undifferentiated cells called a:
A. blastula. B. gastrula. C. meristem. D. zygote. E. neurula.
Which of the photographs in the above figure
represents the angiosperms? a. moss b. fern c. conifer d. monocot e. all of thes
If a cuticle is removed from a leaf, the leaf will
a. be unable to carry on photosynthesis. b. be unable to carry on transpiration. c. lose water and wilt. d. replace the cuticle with a layer of suberin. e. immediately close its stomata to prevent water loss.