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Helen [10]
3 years ago
13

How do scientists know that humans originated in Africa?

Biology
1 answer:
exis [7]3 years ago
4 0
The oldest bones of human decent were found in Africa
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This primitive fish was the ancestor of land-dwelling tetrapods (amphibians, reptiles, mammals and birds), although fish of this
HACTEHA [7]

Answer:

The correct answer is option B. lobe-finned fish.

Explanation:

Lobe finned fishes or the Sarcopterygii is a group or clad of fish that contain the coelacanths, tetrapods, lungfish, and other fossil relatives. ray-finned fishes and lob finned fishes are the are sister groups.  

The major characteristic feature of this fish is the presence of lobe in their fins. The ancestral records explained that the land-dwelling tetrapods are evolved from the lobe-finned fishes around four four hundred million years ago.

Thus, the correct answer is option B. lobe-finned fish.

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3 years ago
______ DNA is held within the cell's nucleus.
Fynjy0 [20]
Eukaryotic.


In prokaryotic cells, the dna is inside the cytoplasm
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Large indentions on the moon's surface, are known as craters.

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Match each term with the appropriate description.
zheka24 [161]

Answer:

A = 1

B = 4

C = 5

D = 3

E = 2

F = 6

Explanation:

A) Peptide hormones are not lipid soluble hence known as lipophobic and cannot diffuse through cell membranes examples of peptide hormones include luteinizing hormones, thyroid stimulating hormones, insulin and follicle-stimulating hormones.

B) Steroid hormones can not stored in secretory vesicles because of their lipophilic nature.

C) Amino acid-derived hormone are the hormones which are derived from tyrosine and tryptophan.

D) Anterior pituitary lobe of Pituitary gland is true endocrine gland of epithelial origin.

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