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Effectus [21]
3 years ago
12

Earth’s first life forms were __________. aerobic cyanobacteria photosynthetic chemoautotrophs

Biology
2 answers:
SCORPION-xisa [38]3 years ago
4 0
Photosynthetic is the correct answer,
Delicious77 [7]3 years ago
3 0
The answer to your question would be Photosynthetic 
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Plant cells, unlike animal cells, are characterized by the presence of a ______. Cell wall and contractile vacuole nucleus and c
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Answer:

The correct option is cell wall and central vacuole.

Explanation:

The cell wall can be described as an additional membrane around the cell membrane which is present in the plant cells but is absent in animal cells.

The plant cells also have a vacuole located at the center on the cell. The central vacuole is absent in animal cells. It stores the waste and other materials for the plant cell. The plant vacuole also provides support to the cell.

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3 years ago
What muscles are involved in knee flexion and extension?
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Extension: Produced by the sartorius and quadriceps femoris group of muscles. Flexion: Produced by the biceps femoris, semitendinosus, and semimembranosus muscles. The popliteus muscle facilitates this movement by unlocking the fully extended knee joint.
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3 years ago
Several students were having a discussion about the role of chromosomes in inheriting traits.
serious [3.7K]

Answer:

Chromosomes are the structures found in the nucleus of a cell. They are made from DNA, containing hereditary information in the form of genes that control how an organism will look and behave.  

Chromosomes come in homologous pairs (one from each parent) that each contain thousands of genes, determining traits expressed in the offspring.

Explanation:

Chromosomes are the structures found in the nucleus of a cell. They are made from DNA, containing hereditary information in the form of genes that control how an organism will look and behave.  - this is true. Prior to cell division, DNA molecules are organized into large structures called chromosomes. Specific regions of a DNA molecule are called genes. These dictate specific proteins which control our traits.

Genes contain thousands of chromosomes that carry specific information about building proteins for a particular trait.  - this is false - genes are segments of DNA that control specific traits by dictating the structure and functions of proteins. Chromosomes contain thousands of genes

Chromosomes are small sections of DNA that contain specific information about a trait to build proteins that people inherit. The thousands of different chromosomes passed from the parents allow for humans to look uniquely different. - this is false - chromosomes are large structures, genes are the relatively small sections of DNA. Humans have 23 pairs of chromosomes, not thousands.

Chromosomes come in homologous pairs (one from each parent) that each contain thousands of genes, determining traits expressed in the offspring.  - this is true. In diploid organisms, like humans, have two copies of each chromosome. These chromosomes contain slightly different versions of genes, which make us unique.

7 0
3 years ago
Identify the parts of the female and male reproductive system and their functions. ​
Lena [83]

<u><em>Female:</em></u>

*Ovaries - release of oocytes (eggs), estrogen and progesterone.

*Oviducts (fallopian tubes) - where fertilization of the oocyte occurs to form a zygote.

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*Cervix and vagina - allow for the entry of sperm for fertilization

<u><em>Male:</em></u>

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*Penis - releases sperm into the external environment for fertilization to occur

I hope I helped!

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