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3 years ago

Describe the motion of the continents from the cambrian period through the quaternary period

2 answers:

5 0

The Cambian period is the time period from approximately 540 to 500 million years ago when most of the major groups of animals first appear in the fossil record. In this period Rodinia began to fragment into smaller continents and continents distributed within 60 degrees of the paleoequator.The dispersal of continents in the Cambrian is a result of the fragmentation of Rodinia

irinina [24]3 years ago

4 0

During the Cambrian period, the continents were very closely placed together. Nearly the entire land mass of Earth was in the same place. Over time, with continent drift, those continents began to spread out and water came between the continents to how we know the world today. Now there is a giant ocean between North America/South America and Europe/Asia/Africa, where there wasn't before.

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The andromeda galaxy is located approximately 2.5 million light- years from earth. Why is the light that reaches earth 2.5 milli

Ivan

So, the Sun's light takes about 8.3 minutes to reach us. This means that we always see the Sun as it was about 8.3 minutes ago. ... The nearest large galaxy to us, Andromeda, is 2.5 million light-years away. So, we see Andromeda as it was 2.5 million years in the past.

5 0

2 years ago

A gland is a group of cells or an organ that

Karo-lina-s [1.5K]

Answer:

secretes hormones

Explanation:

endocrine system

8 0

3 years ago

The psychologist most closely associated with the school of functionalism is

Nostrana [21]

Answer:

Explanation:

Edward B. Titchener. Functionalists, including psychologists William James and James Rowland Angell, and philosophers George H, they stressed the importance of empirical, rational thought over an experimental, trial-and-error philosophy.

hope it helps

3 0

3 years ago

A woman with type A blood (whose father was type O) has children with a man that has type O blood. Both individuals are heterozy

Fantom [35]

Answer:

Explanation:

A woman with type A blood (whose father was type O) meaning her genotype is AO mates with

Man that has type O blood (OO genotype)

Both are heterozygous for MN blood group and both also heterozygous for the FUT1 gene controlling the synthesis of the H substance (Hh)- which determines the expression of the A and B antigen.

Cross

A O M N H h

O AO OO M MM MN H HH Hh

O AO OO N MN NN h Hh hh

Type A- 1/2 O-1/2 type M- 1/4 MN-1/2 N- 1/4, type H- 3/4 h-1/4

Type A with M antigen:

1/2*1/4*3/4 = 3/32

Type A with M and N antigens:

1/2*1/2*3/4 = 3/16

Type A with N antigen:

1/2*1/4*3/4 = 3/32

Type O with M antigen:

1/2*1/4*3/4= 3/32

Type O with M and N antigens:

1/2*1/2*3/4 = 3/16

Type O with N antigen:

1/2*1/4*3/4 = 3/32.

The 3/4 value comes from the expression of Hh-3/4 (this determines if the A and B Angie will be expressed).

8 0

3 years ago

A geneticist is studying two traits in the fruit fly - eye color and wing shape. They perform a dihybrid cross. If the genes for

Len [333]

Answer:

3/16

Explanation:

According to Mendel's law of independent assortment of genes, when a dihybrid cross involves two genes that assort independently and one of the parents is dominant for the two genes and the other is recessive, the phenotypic ratio of the offspring at F2 would be 9:3:3:1. The proportion of the offspring with the dominant parental traits would be 9/16, those with the recessive parental traits would be 1/16, while those with mixed traits would be 3/16 each.

Assuming the eye color is represented by E and the wing shape is represented by W. At F2

EeWw x EeWw

E_W_ - 9/16 (dominant for both eye color and wing shape)

E_ww - 3/16 (dominant for eye color and recessive for wing shape)

eeW_ - 3/16 (recessive for eye color and dominant for wing shape)

eeww - 1/16 (recessive for both eye color and wing shape)

Hence, the proportion of the offspring with dominant phenotype for eye color and recessive phenotype for wing shape would be 3/16.

3 0

3 years ago