What is the top most layer of earth that is extremely dense and only somewhat thick

Darwin collected and studied many specimens to understand natural selection on the Galapagos Islands. Which organisms did he study while he was there?

Which of the following is an invertebrate? A. sponge B. bird C. fish D. dolphin

An animal that regulate its body temperature by producing heat within its own tissue -community -decomposer -ecology -ecosystem -endotherm

According to biogenesis, these four organisms began their life as A) a fertilized egg and grew as a result of cell division. B) a single cell and relied on mitosis for cell replication.

Which of the following statements about Polymerase Chain Reactions is wrong? (A) DNA is briefly heated to break the hydrogen bonds holding two strands together.

The Kobe habor wharfs where the center of Japanese exports to other countries. It had 200 wharfs before the earthquake. How many wharfs remained undamaged after the earthquake? A. 130 wharfts B. 3 wharfs C. 30 wharfs

How do the pollutants that cause acid rain get into the air?

Hunters kill all of the wolves in a region. The wolves mostly ate deer. Why might there be fewer deer a few years after the wolves are killed?

Normal chlorophyll development in plants requires the presenceof at least one dominant allele at gene A and at least one dominantallele at gene B. Double homozygous recessive plants (a b / ab) lack chlorophyll and are white.

Onion cell and elodea cell