______ are where saltwater and a source of freshwater mix.
a. Wetlands
b. Estuaries
c. The benthic zone
d. Channels
b. Estuaries
Estuaries are where saltwater and a source of freshwater mix. Once or twice a day, high tides bring salt water into the estuary. Low tides occurring at the same frequency reverse the current of salt water.
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Chemical signals such as __________ have roles in social communication. Fill in the blank(s) with the appropriate word(s)
Label the parts of the model animal cell
M 119. _____ components of cytoskeleton M 120. _____ DNA + nucleoplasm M 121. _____ Golgi body M 122. _____ lysosome D 123. _____ microfilaments D 124. _____ microtubules E 125. _____ mitochondrion E 126. _____ nuclear envelope M 127. _____ nucleolus E 128. _____ nucleus M 129. _____ pair of centrioles E 130. _____ plasma membrane M 131. _____ ribosomes M 132. _____ rough ER M 133. _____ smooth ER M 134. _____ vesicle
Masses of air and water are deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere
Indicate whether the statement is true or false
What makes the cells of a developing embryo differentiate into various types of cells?
A) They have different genes. B) Different genes are activated. C) Once certain genes of a cell have caused it to differentiate, the other genes are lost. D) The DNA of their mitochondria is different. E) Special genes in the cytoplasm cause this differentiation.