Such direct observational evidence is limited, however, and clouds remain the biggest source of uncertainty--apart from human choices to control greenhouse gases—in predicting how much the climate will change
Answer:In humans, gametes are haploid cells that contain 23 chromosomes, each of which a one of a chromosome pair that exists in diplod cells.
Explanation:
Answer:
<h2>4</h2>
Explanation:
Lobe-finned fishes are bony fish, having fleshy, lobed, paired fins, these fins are joined to the body by a single bone only . The fins of these lobe-finned fishes differ from all other fishes in many ways, Lobe-finned fish lived in water.
By the passage of time, from fin on lobe-finned fish changed to legs and feet on the early amphibians due to variations among offspring, followed by natural selection. These legs and feet containing amphibians lives both in water and land.
Answer:
D
Explanation:
Conjugation is one of the processes employed by bacteria cells for genetic exchange. It involves the transfer of genetic material from one bacterium (donor) to another bacterium (recepient) via direct contact.
The donor bacterium carries a DNA sequence called Fertility factor or F-factor, which allows it to synthesize a tube-like stucture known as pilus (plural - pili). The pili that performs this function in bacteria is called CONJUGATE PILI. The pilus draws the mating pair (donor& recepient cell) close to each other to form a wall-wall contact triggering the formation of a mating bridge. This bridge enables the transfer of genetic material, usually in form of a plasmid (a small circular piece of DNA capable of replication independently of the bacterial chromosome).
In bacterial conjugation, the process involves a small portion of the genome of the donor cell getting inculcated into the complete genome of the recepient cell. Hence, conjugation is of immense importance to bacteria, as it is an avenue to confer certain genes e.g. antibiotic-resistant genes.
Answer: microorganisms
Explanation: No animal has the ability to digest cellulose directly.
Most animals such as horses and termites cannot directly digest cellulose. The animals have a symbiotic relationship with bacteria in the intestinal tract. The symbiotic bacteria acts on the cellulose and secrets the necessary enzymes (cellulase) to digest cellulose in the intestinal tract. An example of such microorganism in a symbiotic relationship with animals that facilitates the digestion of cellulose is Trichonympha