Cyanobacteria, unusual worm like life-forms and marine organisms did not exist in Precambrian Time.

Answers

Answer 1

Answer: The statement is False.

Precambrian Time spans from about 4.6 billion years ago to about 540 million years ago. Fossils of some bacteria and cyanobacteria are an evidence that the life existed in Precambrian Time. They were the first organism that showed about 3.5 billion years ago. These unicellular organisms lived in the oceans. The first multicellular organisms evolved many years later, around 700 million years ago. Some fossils suggest the presence of some jellyfishes and worm-like forms that lived in the oceans. The land was not settled in the Precambrian time.

Answer 2

Answer:

Answer:

False

Explanation:

I just took the test

Related Questions

How is pushing a ball up a ramp like active transport?
14. Compare How do the skull and brain sizesof modern humans compare to the skulls ofearly primates, such as australopithecines?
All of the following are a part of the excretory system except the __________.
State what is indicated by the presence of polysomes in a cell
What is a limitation of using a ball-and-stick model for DNA?a) Some kinds of atoms that are found in DNA must be left out of the models.b) DNA has so many atoms that the size and cost of a model could be too great.c) It is impossible to distinguish different kinds of atoms with models.d) The chemical bonds between the atoms in DNA must be part of the models.

Leaves appear green because the green portion of the light that strikes them is _____.a. changed to heat
c. destroyed
b. absorbed
d. reflected

Answers

D. Reflected
Whatever color your eye sees is the reflected light. So white, all colors reflected and black, all colors absorbed

Answer:

reflected

Explanation:

Which type of chromosomal mutation is responsible for causing Turner syndrome?

Answers

a Missing or incomplete X chromosome

Pregunta 1 (3 puntos)Which statement describes the role of the organism indicated by the blue arrow in the food web? (3 points)

Answers

Answer:

The blue arrow is in different places in different versions of this question. Can you upload a picture please?

Explanation:

Which of the following forms an important component of phloem tissue?A. tracheids

B.
vessels

C. companion cells

Answers

Answer: The correct answer is- C) Companion cells.

Phloem tissue is a complex conducting tissue that is present in the vascular plants and responsible for the transport of organic compound such as carbohydrates and proteins from leaves to the rest part of the plant.

The various components of phloem tissue are- Sieve element, Companion cells, phloem parenchyma, phloem fiber.

Companion cells are specialized cells ( present in association of sieve element) that perform various metabolic reactions and responsible for cellular activities. They help in loading and unloading of carbohydrate into sieve element.

C. Companion cells. THe vessels are for blood flow, Tracheids are elongated cells in the xylem of vascular plants that serve in the transport of water and mineral salts.

Ultraviolet light causes production of vitamin d3 in the cells of the __________. ultraviolet light causes production of vitamin d3 in the cells of the __________. hypodermis epidermis dermis all of the listed responses are correct.

Answers

Epidermis

I think you coppied and pasted it one to many times, so I hope it's just one answer.

Final answer:

Ultraviolet light primarily causes the production of Vitamin D3 in the cells of the epidermis. Smaller amounts are also produced in the dermis and hypodermis.

Explanation:

Ultraviolet light stimulates the production of vitamin D3 primarily in the cells of the epidermis, which is the outermost layer of your skin. Additionally, a smaller amount of vitamin D3 production happens in the deeper layer known as the dermis and the hypodermis. However, most references will identify the epidermis as the main site for this production because it has the highest exposure to sunlight, which is crucial for vitamin D3 synthesis.

Learn more about Skin and Vitamin D3 Production here:

brainly.com/question/36891725

#SPJ12

What is mendel's law of independent assortment?

Answers

The principal originated by Gregor Mendel, stating that when two or more characteristics are inherited, individual hereditary factors assort independently during gamete production, giving different traits an equal opportunity of occurring together.

Hope this helps!

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