Answer: diazotrophs
Explanation: The organisms responsible for the fixing of nitrogen are microorganisms called diazotrophs
The level of cell organization from the simplest to the most complex.
1) cellular level
2) tissue level
3) organ level
4) system level
5) organism level.
Actually there are 12 levels of organization from the simplest to the most complex.
1) molecule
2) cell
3) tissue
4) organ
5) system
6) organism
7) species
8) population
9) community
10) ecosystem
11) biome
12) biosphere
Answer: B. by toxic chemicals (in smoke) or radiation that can damage the DNA in cells.
Explanation:
The carcinogens presents in cigerates covalently bind to DNA and form DNA adducts which results into miscoding (e.g., insertion of the wrong base) during replication of DNA and this genetic mutation causes uncontrolled cellular growth which causes cancer.
Ionising radiation including X-rays, radioactive particles, and gamma rays,can cause cancer by damaging DNA. high-energy radiation damages DNA and cause genetic mutation same as cigerates and causes cancer.
Both toxic chemicals (in smoke) or radiation damages DNA inthe cells which leads to cancer.
Hence, the correct option is B.
Answer:
Changes in natural flow regimes as a result of water extraction and supply direct modification or destruction of important habitat barriers to the movement of the plants and animals.
Explanation:
The original DNA strands are used as a template during replication<span />
