Answer:
4.54 billon years
Explanation:
the earliest time that life forms first appeared on Earth is at least 3.77 billion years ago possibly as early as 4.28 billion years
Answer: Basically cells make up tissues, tissues make up organs, and organs make up organ systems.
Explanation:
<h2><em>★</em><em> </em><em>«</em><em>What are the impacts of human beings on biodiversity ?</em><em> </em><em>»</em><em> </em><em>★</em></h2>
- <em>destruction, degradation and fragmentation of habitats. reduction of individual survival and reproductive rates through exploitation, pollution and introduction of alien species.</em>
<h2><em>hope</em><em> it</em><em> helps</em><em>!</em></h2>
The discoverers of DNA were not
James D Watson and Francis Crick. They are the first scientist to formulate an
accurate description of the DNA’s (deoxyribonucleic acid) complex ,
double-helical structure. They discovered that base pairing nucleotides must
be; adenine and thymine; and cytosine and guanine. These base pairs are held
together by a hydrogen bond, atype of chemical reaction that s easy to break
and easy to reform. The statement is “DNA
is a double helix made of two strands linked together with hydrogen
bonds.”
