Briefly discuss some disadvantages of aquaculture
What will be an ideal response?
Dense concentrations of farmed aquatic animals can increase the incidence of disease, which reduces food security, necessitates antibiotic treatment, and results in additional expense. Aquaculture can also produce high amounts of waste from the farmed organisms and from the large portion of feed that goes uneaten and decomposes in the water column. Farmed aquatic fish and other organisms are often fed grain or ocean-caught fish, affecting food supplies and wild fish populations. If farmed aquatic organisms escape where they are not native, they can cause unpredictable harm by spreading disease or outcompeting native organisms.
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La Niña indicates warmer than normal surface temperatures in the equatorial Pacific.
Answer the following statement true (T) or false (F)
The greater the atomic number, the greater the atomic mass
A. usually. B. always. C. occasionally. D. never.
Which of the following statements describes the air motions beneath and between fair-weather cumulus (cumulus humilis) clouds?
A. Downdrafts occur beneath them, and updrafts occur between them. B. Updrafts occur beneath them, and horizontal motions occur between them. C. Downdrafts occur beneath them, and horizontal motions occur between them. D. Updrafts occur beneath them, and downdrafts occur between them.
How many valence electrons does gallium (Ga, atomic no. = 31) have?
A. 1 B. 3 C. 70 D. 6 E. 31