What are leaf veins?
a. vascular bundles of leaves
b. photosynthetic cells of leaves
c. sclerenchyma cells of leaves
d. palisade mesophyll of leaves
e. spongy mesophyll of leaves
ANSWER: a
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Recently, the bones (not fossils) of a possible new species of humans (in the genus Homo) have been found on an island in Indonesia (an island nation southeast of Asia)
Using radiometric dating, scientists can show that these people were alive as recently as 17,000 years ago. According to the information in this chapter, why do you think they probably used tools?
Which of the following is NOT a feature associated with viruses?
A. Cytoplasm B. Genetic information C. Protein coat D. Envelope
Plasma cells produce (antibody/chemokine/cytotoxic) molecules
What will be an ideal response?
A ______ is generally a fake medicine used to disguise the treatments of participants in an experiment.
Fill in the blank(s) with the appropriate word(s).