Sea animals and land animals? I don’t really knoe
Answer:
Fossil Z is younger than Fossil Y.
Explanation:
For any age-related questions in geology, we have to consider the basic principle of stratigraphy. According to which, sediment layers on top harbor younger fossils whereas <u>layers</u> on the <u>bottom</u> have <u>older fossils</u>. In the case given here, Fossil Z is younger because it is in the top layer and Fossil Y is in the middle layer. The other two options are completely wrong because Fossil Y cannot be older than Fossi X and likewise, Fossil Z doesn't exist in multiple periods rather it is present only once.
Answer: It is the indiscriminate dumping of nonuseful substances into water bodies
Explanation:
Water pollution occurs when non-useful substances like chemical, industrial, human wastes etc, are dumped into water bodies (oceans, rivers, lakes) as a means of disposing such wastes
For instance: water pollution occurs when unused battery is drop in the lake, sewage is dumped in the river etc
Answer:
The answer is C. Their cells have nuclei.
Answer:
Answer is B.
Explanation:
<u>Period is duration of time</u>.
Period can be of a second,minute,hour or of Some years.We will give unit according to the duration of time.In the given options second is most obvious because it is used to measure time.