Answer:
1 ). Earthworms have what are called closed circulatory systems. Closed circulatory systems are those in which the blood is kept in a closed system of vessels, like in humans. Open circulatory systems are when the blood is pumped into a body cavity called a hemocoel, allowing the blood to surround the organs.
2). Crayfish also have an open circulatory system. Blood flows into the heart through dorsal ostia, and is pumped into body sinuses through arteries at both the posterior and anterior ends of the ventricle.
Explanation:
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You would want to expect warm and rainy weather
Messenger RNA, or mRNA, molecules are produced by the process of transcription from DNA molecules. During this process, complementary base pairing takes place. The bases present in the DNA molecule are:
Adenine, Thymine, Guanine and Cytosine. The complementary bases on mRNA molecules are:
Adenine (A) in DNA binds to Uracil (U) in mRNA
Thymine (T) in DNA binds to Adenine (A) in mRNA
Cytosine (C) in DNA binds to Guanine (G) in mRNA
Guanine in (G) DNA binds to Cytosine (C) in mRNA
Answer:
A heterogeneous mixture of water, carbon dioxide, oxygen, glucose molecules