(d) Earthworm has a closed blood vascular system.
A closed blood vascular system is a circulatory system in which the blood is enclosed in blood vessels and is circulated by a heart. The blood vessels transport oxygen and nutrients to the cells and remove waste products. This type of circulatory system is more efficient than an open circulatory system, in which the blood flows through the body cavity and does not have a dedicated network of vessels. Earthworms have a closed blood vascular system with a tubular, segmented body, which has a well-defined circulatory system consisting of a heart, blood vessels and capillaries. The blood vessels transport oxygen and nutrients throughout the body, which are essential for the earthworm's survival. Cockroaches, Hydra and Sponges do not have a closed blood vascular system.
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Answer:
(d) Earthworm
Explanation:
Closed blood vascular means that the worm's blood flows only in one direction and is contained within vessels. And there are three main vessels that supply the blood to organs within the earthworm : 1- the aortic arches, 2- dorsal blood vessels, and 3- ventral blood vessels.
a rooster with grey feathers is crossed with a hen of the same phenotype. they produce 15 chicks with grey feathers, 7 chicks with black feathers, and 8 chicks with white feathers. what is the simplest explanation for this inheritance pattern?
The simplest explanation for this inheritance pattern is that the rooster and the hen are both heterozygous for the gene that controls feather color and they are both carrying one dominant allele for grey feathers and one recessive allele for black or white feathers.
What is the definition of phenotype?Phenotype refers to the observable physical and physiological characteristics of an organism, which are determined by the combination of its genetic makeup (genotype) and the environment. Phenotype is the physical appearance of the organism which we can observe and measure, it can be shape, size, color, etc.
When rooster and hen cross, the dominant allele for grey feathers masks the expression of the recessive alleles, so all of the offspring appear grey. However, when the offspring inherit one dominant allele and one recessive allele from each parent, the recessive alleles are able to express their phenotype in a ratio of 7 black feathers: 8 white feathers offspring.
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What happens to Claire's baby in Outlander?.
Claire's baby died in a miscarriage in Outlander.
Clаire Frаser is one of the most empowering chаrаcters in the romаntic fаntаsy Outlаnder. Clаire hаs trаveled аcross the world with her hаndsome Highlаnder husbаnd аfter mysteriously pаssing through а circle of stones аnd lаnding up in 18th century Scotlаnd.
Clаire might hаve experienced the most fаntаstic аdventures, but she hаs аlso been through severe trаumа. She hаs seen blood, gore, аnd guts spilling out of people she couldn't sаve. She hаs аlso lost а bаby in а pаinful miscаrriаge аnd lived twenty yeаrs of her life in аn unhаppy mаrriаge аwаy from the mаn she loved.
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How do you make RNA from a cell?.
DNA transcription, which shares certain characteristics with DNA replication in how it produces all of the RNA in a cell, is how DNA is replicated. A little section of the DNA double helix is first opened and unraveled during transcription in order to reveal the nucleotides on each DNA strand.
Simply put, producing a gene's matching protein is called expression, and it involves a complex process with two main components. The initial step of transcription is the transformation of DNA information into an mRNA (messenger RNA) molecule. The manufacture of a pre-mRNA molecule is aided by the enzyme RNA polymerase II, which also catalyzes the transcription of complementary base pairs from a gene's DNA to create mature mRNA. The resulting mRNA needs to be translated into a protein molecule because it is a single-stranded copy of the gene.
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Explain how a palisade mesophyll cell is adapted for its function
Palisade mesophyll cells are closely sealed to soak maximum light. They are at right angles to the leaf surface to reduce the number of transverse walls. A large vacuole pushes the chloroplast to the edge of the cell.
Chloroplasts at the edge enable a shorter diffusion path for carbon dioxide and absorb maximum light. There are cylindrical cells and air spaces to provide a store of carbon dioxide. These cells provide a large surface area and moist cell surface for easy diffusion of gases. Chloroplasts in these cells can move towards light and move away from high light intensity to avoid damage.
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