<span>Cattle and sheep are exposed to lead and zinc when these poisons are in the grass/soil.
Cattle and sheep graze on the grass, and thus they intake these minerals, such as lead and zinc when they come in contact with grass or earth they may eat along with grass. Thus they are exposed to them via eating.
</span>
Answer:
The correct answer would be option A.
Explanation:
Gina's model lacks many important factors about the particular study of damage to tree bark in the forest. This model does not explain the number of animals entering a particular area of forest.
This model does not tell, how much damage has been done. It also fails to tell what type of damage the tree has faced. It does not explain what type of bacteria evolved or carried by the animal.
Thus, the correct answer would be option A.
Answer:
The amount of sediment a stream can carry depends on the speed and size of the stream. The speed of the water in a stream depends on its slope. The steeper the slope, the faster the water moves. Fast-moving or large streams can carry more sediment than slow-moving or small streams.
Answer: The statement is true
Explanation:
Gene activation is one of the ways hormones exert their functions. And this require a second messenger system.
Usually, the hormone:
- binds to a specific receptor protein on the target cell
- the bound-complex causes the formation of second messengers such as cAMP (a cyclic nucleotide) that diffuses into the nucleus and binds directly with DNA, ACTIVATING GENE and switching "on" or "off" protein synthesis.
Answer: -70
Explanation:
Most cells have electrical potential difference between -40 and -70 millivolts.