Answer:
Fossils provide direct evidence of evolution. They show the changes of animals from ancient organisms to present form. Fossils are the preserved remains of earth layers. There are 4 types of fossils-
Original fossils that are not very old. e.g. teeth, skeleton, shells.
Frozen fossils
less permanent fossils
casts, molds, and prints - wings, skin, leaves, etc.
The fossils show the adaptive radiation in horses, humans. The transition fossils form the connecting link between different groups such as fish and amphibians, reptiles and birds, etc.
e.g. Archeopteryx is the connecting link between the reptiles and birds.
The modern horse Equus have several ancestor species, we came to know from the fossil records.
The fossil record shows the evolution of humans and their ancestors.
Answer:
Without enough light, a plant cannot photosynthesis very quickly - even if there is plenty of water and carbon dioxide and a suitable temperature. Increasing the light intensity increases the rate of photosynthesis, until some other factor - a limiting factor - becomes in short supply.
Explanation:
The correct answer is: reduce the loss of body heat to the environment. A <span>countercurrent heat exchanger works by transferring heat from one part of the body to another that has cooled down. For example, in dolphins, body parts of a high surface area such as flippers are rich in veins. Blood running through these veins that is cooled down is run close to arteries containing warmed-up blood, and some of the heat energy from the arteries is transferred to the veins, thereby allowing the dolphin to conserve heat energy. </span>
Answer:
1:0 orange eyes:black eyes
Explanation:
If black-eyed mendelian and an orange-eyed mendelian give all the offspring with black eyes, this means that the black eye allele is dominantt over orange eye. So, if we name the gene for the eye color with A, the genotypes of the parents would be AA (black eyes) and aa (orange eyes).
P: AA x aa
F1: Aa Aa Aa Aa (all heterozygous with black eyes).
Cross between two orange-eyed mendelians:
P: aa x aa
F1: aa aa aa aa all of them with orange eyes
<span>Mutagen is an agent that causes DNA mutations. UVA radiation penetrates
deep into the skin and acts as a mutagen. UV light is the most common source of
radiation that affects DNA, but it is a weak radiation and it penetrates only
the surface cells of your skin.</span>