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Sladkaya [172]
3 years ago
8

Throwback Question: Scientists theorize that it took a billion years or more for oxygen in the atmosphere to reach the levels of

today. Based on this idea, the first cells could be classified as which of the following?
1 point
aerobic
anaerobic
eukaryotic
protista
Biology
1 answer:
polet [3.4K]3 years ago
7 0

Answer:

anaerobic i think

Explanation:

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Answer: Helps the plant breathe: The epidermis of the leaf contains guard cells that control and regulate the small pores on the undersurface of the leaves. These pores are called stomata. Stomata are responsible for regulating water in and out of the cell. It is also responsible for the exchange of gases across the epidermis.

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Lymph traveling from the left arm would enter the venous circulation via the?
ira [324]

Lymph traveling from the left arm would enter the venous circulation via the thoracic duct.

<h3>What is thoracic duct?</h3>
  • The largest lymphatic channel in the body's lymphatic system is the thoracic duct, commonly known as van Hoorne's canal.
  • Adults have an average length of 40 cm, and their abdominal origin is about 5 mm wide.
  • The thoracic duct runs from the root of the neck to the twelfth thoracic vertebra.
  • The thoracic duct enters the posterior mediastinum, remaining to the right of the vertebral column, by ascending via the diaphragm's aortic hiatus.
  • At the T7 vertebral level, it runs posterior to the esophagus before crossing over to the left side of the thorax at the T5 vertebral level.
  • The primary lymphatic channel for the return of chyle/lymph to the systemic venous system is the thoracic duct.
  • It drains lymph from the left side of the face and neck, left hemithorax, left upper limb, and both lower limbs.

Learn more about thoracic duct here:

brainly.com/question/19241374

#SPJ4

8 0
1 year ago
A researcher collects what appears to be a new species in a freshwater stream. Microscopic analysis shows the presence of chloro
algol [13]

According to the research, this new species most likely belongs to the Protista kingdom since it has a defined nucleus.

<h3>What is the Protista kingdom?</h3>

They are unicellular or multicellular microorganisms that, for the most part, feed autotrophically, and that, on the other hand, cannot be included in the remaining three kingdoms of eukaryotes.

It can be both autotrophic and heterotrophic by photosynthesis, although many of them combine both forms of nutrition and have chloroplasts, mitochondria, a defined nucleus, among other structures.

Therefore, we can conclude that according to the research, this new species most likely belongs to the Protista kingdom since it has a defined nucleus.

Learn more about Protista kingdom here: brainly.com/question/925018

#SPJ1

5 0
2 years ago
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