Answer:
electromagnetic waves can travel in a vacuum
Explanation:
Answer:
Sister chromatids.
Explanation:
Sister chromatids are the two identical halves of a chromosome that are held together at centromere with help of cohesin. DNA replication in the S phase of the cell cycle doubles the amount of DNA. The copies of the DNA formed during DNA replication are accommodated in sister chromatids. Hence, two sister chromatids of a chromosome carry the identical DNA helices and associated proteins.
<span>The sea lions have been trained to perform this behavior through positive reinforcement. Positive reinforcement is when a desired behavior is rewarded. In this case the behavior is catching balls on their noses and the reward is fish.</span>
The correct answers are:
A) Nonrenewable resources create terrible pollution problems;
D) Once nonrenewable resources are used, they cannot be replaced, so we are not able to acquire more;
The nonrenewable resources are by far the most used resources across the globe. From side they are relatively cheap and are very efficient, but from the other side they are the biggest polluters and their reserves are becoming less and less. Being the biggest polluters, this resources create a lot of problems like the bad air quality, acid rains, and the climate change. Also, this resources are limited, so once the reserves of them are spent there will be no more of them, thus the humanity will be in big trouble if a proper solution is not found until then.
All of the above.
They can be prevented, especially Polio.
Smallpox is common in children, but potentially deadly in baby's.
Influenza is the flu.
