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Yuliya22 [10]
3 years ago
6

How was the Cretaceous period different from the jurassic period

Biology
2 answers:
Maksim231197 [3]3 years ago
5 0

Answer:

How was the Cretaceous period different from the Jurassic Period?

a.

The Jurassic period had angiosperms, while the Cretaceous did not.

b.

Pangaea split during the Jurassic period.

c.

There were dinosaurs in the Jurassic period, which went extinct in the Cretaceous period.

d.

Conifers and ferns were present in the Jurassic period, but not in the Cretaceous period.

Explanation:

ANSWER IS C

aivan3 [116]3 years ago
3 0
Pangea split during the Jurassic Period. There were dinosaurs in the Jurassic Period, which went extinct in the Cretaceous Period. Conifers and ferns were present in the Jurassic Period, but not in the Cretaceous Period.
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Environmental factors can influence natural selection because they can increase or decrease
olchik [2.2K]

Answer:

Environmental factors can influence natural selection because they can increase or decrease the amount of genetic variation in a population.

Explanation:

Natural selection is a process that involves the survival of species through changes in the expression of their genes, making possible the process of adaptation to environmental changes. It is one of the explanations for the biological evolution of species.

The second premise, necessary for natural selection to be possible, implies the existence of a variability (genetics) of traits among individuals in a population.

The other premises of natural selection are the faculty of traits to be inheritable and that genetic variability should lead to reproductive success and survival.

  • <em>The other options are not related to the process of natural selection, since it is not possible for natural selection to increase or decrease the number of chromosomes, in addition to the fact that genetic variability must be observed in a population, not in a single individual, to be considered natural selection </em>
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3 years ago
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Cilia and flagella bend because of _____. cilia and flagella bend because of _____. the quick inward movements of water by osmos
Ronch [10]

Answer;

-A motor protein called dynein

Cilia and flagella bend because of a motor protein called dynein.

Explanation;

-Both prokaryotic and eukaryotic cells contain structures known as cilia and flagella. These extensions from the cell surface aid in cell movement. They also help to move substances around cells and direct the flow of substances along tracts.

-Cilia and flagella are formed from specialized groupings of microtubules called basal bodies. If the protrusions are short and numerous they are termed cilia. If they are longer and less numerous they are termed flagella.

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Does peterson's solution to the mutual-exclusion problem shown in fig. 2-24 work when process scheduling is preemptive
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<span>Yes. Not only does Peterson's Solution work with preemptive scheduling, but it was designed for that very case. In fact, when scheduling is non-preemptive, there is a possibility it might fail. For example, in a case where 'turn' is initially 0, but process 1 runs first, it will loop perpetually, and never release the CPU.</span>
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Which ventricle contains a thicker layer of myocardium (heart muscle)?
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Antennae development in ants is thought to be a trait controlled by maternal effect. In ants, zig-zag coils are dominant to curl
Schach [20]

Answer:

a. Her mother has zig-zag antennae.

b. Her brother has zig-zag antennae.

Explanation:

<u>Available data</u>:

  • Antennae development ⇒ controlled by maternal effect
  • Zig-zag coils are dominant
  • Curly coils are recessive
  • A female develops zig-zag coils

Maternal effect: Refers to the influence of the “environment provided by the mother” on the progeny phenotype. The mother´s genotype directly determines the progeny phenotype. Even though the progeny has a different genotype, it is irrelevant, as well as the father´s genotype or phenotype. This means that no matter what is the genotype of the offspring, all of them will express the same phenotype as their mother. The maternal effect is commonly seen in insects and might be seen in some mammals and plants.

So, if a female has zig-zag coils, this means that the mother also has zig-zag antennae and that all the brothers and sisters of this female ant have zig-zag antennae, independently of their genotype.

a. Her mother has zig-zag antennae ⇒ True. The trait is inherited from the mother.  

b. Her brother has zig-zag antennae ⇒ True. The whole progeny will express sig-zag antennae.

c. This female carries the zig-zag allele ⇒ Not necessarily.

d. This female's offspring will have zig-zag antennae ⇒ Depends on it´s genotype

3 0
2 years ago
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