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tester [92]
3 years ago
9

What are the two subdivisions of the Precambrian Era called?

Biology
2 answers:
Irina-Kira [14]3 years ago
6 0
Archean and Proterozonic which are both broken into early middle and late periods
erik [133]3 years ago
5 0

Answer:

Two major subdivisions of the Precambrian era are Archean and Proterozoic.

Explanation:

The whole period of earth before the formation of the oldest rocks is known as the Precambrian period. It comprises all geological time before 600 million years ago. The two major subdivisions of the Precambrian period are-

1. Archean - It is an older subdivision of the Precambrian period prior to 2500 million years ago. It can be divided into early, middle and late.

Most abundant fossils are found during this period. In this period microfossils of photosynthesizing bacteria known are found.

2. Proterozoic- It is the second major subdivision of the Precambrian period prior to 600 million years ago up to 2500 million years ago. Traces of the Edicara fauna, bacteria, and blue-green algae and first oxygen dependent life-form are found in the Proterozoic period.

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Varieties of plants in which self-fertilization produces offspring that are identical to the parents are referred to as monohybr
Mademuasel [1]
Varieties of plants in which self-fertilization produces offspring that are identical to the parents are referred to as true-breeding. In this process the parents will pass down specific phenotypic trait of their offspring.  True bred organisms will have pure genotype (genetic make up of an organism) and will therefore produce certain phenotype. 
4 0
4 years ago
Which of the following statements is not true?\
azamat

Answer:

D. Water is the most abundant atom in Earth’s atmosphere.

Explanation:

An atom can be defined as the smallest particle of an element (e.g., oxygen, hydrogen, etc). Water is a molecule (H2O) because its atoms are connected by molecular bonds (i.e., water is not an atom). Water is the most abundant molecule on the Earth's surface which covers more than 70 percent of the world's surface. A water molecule contains one oxygen (O) and two hydrogen (H2) atoms which are connected by covalent bonds. Water is also a compound known as a diatomic molecule, i.e., a molecule composed of two atoms of the same type.

4 0
3 years ago
Which of the following is a major trend in land plant evolution? Group of answer choices the trend toward a gametophyte-dominate
Leviafan [203]

Answer:

trend toward a sporophyte-dominated life cycle

the trend toward larger gametophytes

Explanation:

<em>The major trend in the evolution of land plants is the domination of the sporophytic phase in the life cycle and alternation of generation. It also moves towards a larger gametophytes</em>

In lower plants, the gameophyte phase was dominant in the life cycle while in bryophyte, both gametophyte and sporophyte phase are co-dependent.

The sporophyte phase is the diploid phase while the gametophyte phase is the haploid phase.

Also, the gameotyptic stages are quite microscopic (usually in the form of spores) in lower plants while they become bigger in land plants (in the form of ovary and pollen) although with fewer cells.

8 0
3 years ago
Which compound demonstrated a constant rate of increase of solubility as the temperature was increased from 0°C to 60°C
saw5 [17]

potassium Iodide, I had this on USA test prep

4 0
3 years ago
Read 2 more answers
5. Between which depths is the thermocline?
Talja [164]

Answer:

B. 100 and 1000 m

8 0
3 years ago
Read 2 more answers
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