We use urainium to date the remains
In 1940 Matthew and Marion Stirling found basalt altars at the site of La Venta.
Matthew Stirling was an ethnologist and archaeologist that was sent on expeditions to the Mexican Gulf Coast area to further research the <span>Olmec culture. It was in then years around 1940 that he found with his wife, Marion, several sculptures and monuments in that area. In 1940 he found several altars in La Venta.</span>
The correct answer is: Artificial selection (selective breeding).
Artificial Selection is a form of selection, totally influenced by human, in which traits that should be passed onto offspring are chosen by human. Selective breeding was used long before the genetics was discoverd. Farmers used individuals with beneficial traits, larger in size, with bigger fruit etc.
Hunting is also one type of selective breeding, since the hunters choose the animal and remove it from the population (gene pool), leaving the “weaker” to pass on to the next generation.
Answer:
3. Endotherms spend more energy on internal temperature regulation compared to ectotherms.
Explanation:
Ectotherms, are considered as cold-blooded animals (reptiles and amphibians), and are organisms that don't have the ability to generate enough heat to keep themselves warm. Endotherms, in contrast, do possess the ability to generate their own body heat.
Endotherms also called warm blooded animals (mammals) have the ability to regulate their body temperature by themselves. If the endotherms are in a cold place their body increases the metabolism and generates more heat. This will compensate for the cold outside.
