<span>If Noam chooses a filter, it might be more effective than a screen. After using it for a while, though, he will have to replace it, which could be expensive. A screen might be less effective, but it can be cleaned instead of replaced.</span>
Answer:
below
Explanation:
Greenhouse gas increases will cause an increase in desert areas on Earth. Current desert areas will grow as
temperatures cause increased evaporation. Humans will migrate away from these areas of low water and
productivity
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:
The calcium concentration must be greater OUTSIDE
the cell than INSIDE the cell.
Explanation:
Calcium has a vital role in the body, it is necessary for:
- exocytosis
- muscle contraction
- normal excitability of neurons
- blood coagulation
- building and maintaining bones and teeth
- enzymatic activity
