All categories

3 years ago

The first known bird fossils date to which era of time

Biology

2 answers:

kramer3 years ago

6 0

The first known bird fossil date to the mesozoic era of time.

Explanation:

The first known bird fossil is Archaeopteryx.
Archaeopteryx were not exactly like modern birds and are called dinosaur like birds..
Carbon dating suggest that these birds evolved during the jurassic period of mesozoic era.
These are considered as the only birds of that era.
Ancestors of modern birds began to evolve during cretaceous period and kept on evolving through Cenozoic era.

Likurg_2 [28]3 years ago

6 0

Answer:

Jurassic

Explanation:

I took the test for pf

You might be interested in

How does independent assortment increase genetic variation in Meiosis?

KIM [24]

Answer:

Independent assortment produce new combinations of alleles.

Explanation:

In meiosis I, crossing over during prophase and independent assortment during anaphase creates sets of chromosomes with new combinations of alleles. Genetic variation is also introduced by random fertilization of the gametes produced by meiosis. It results in gametes that have unique combinations of chromosomes.

3 0

3 years ago

Which factors determine strength of gravitational force between two objects?

DIA [1.3K]

Answer:

mass and distance

Explanation:

As the two objects get further away, the distance between them increase and the strength of the gravitational force decreases. If the distances decreases, the force will increase. The bigger the object, the greater the force.

3 0

4 years ago

Read 2 more answers

To say that species a is more closely related to species b than to species c is to say that a and b?

slega [8]

yes, because its close to a and b.

5 0

3 years ago

Define the following terms. Drag and drop the words into the appropriate blanks to complete the sentences.

FrozenT [24]

Answer:

1. replication

2. gene

3. strand polarity

4. translation

5. complementary base pairing

6. chromosome

7. antiparallel

8. transcription

9. allele

Explanation:

1. Replication is the process by which DNA is duplicated or the process of making another copy of DNA.

2. Gene is the physical unit of heredity i.e a segment of DNA transferred from parents to offsprings. A gene also encodes a useful products such as protein.

3. A DNA strand is a polar molecule, which is attributed to the phosphate group at the 5'-end of DNA and the hydroxyl group at the 3'-end of DNA.

4. Translation is the process whereby the information in a mRNA molecule is used to synthesize a protein.

5. Complementary base pairing is a phenomenon whereby Adenine (A) binds to thymine (T), guanine (G) binds to cytosine (C).

6. A chromosome contains of single long molecule of DNA coiled together around histone proteins. The chromosome is associated with different types of proteins.

7. In the double-stranded DNA molecule, one strand runs from 5' to 3' and the other runs from 3' to 5'. This is called ANTIPARALLEL nature of DNA.

8. Transcription is the process by which a DNA molecule is used to synthesize a mRNA single strand.

9. Allele is the alternative or contrasting form of a gene. Each allele is contributed by each parent

5 0

4 years ago

Which cell types are not part of the nervous system?.

tresset_1 [31]

Answer:

Neutrophils and Macrophages

Explanation:

8 0

2 years ago