ummm I'm so sorry but I don't know the answer to this one. maybe try looking it up? I'm sorry again.
Answer: <span>
1- Holding head erect
2- Sitting on a firm surface without support
5. Bearing majority of weight on legs
By the time the baby is ten months he should be able to support his own head, firmly sit and bear the weight of the body in their legs. Also they crawl and possibly walk using furniture as support.
</span>
Answer:
Genetic drift
Explanation:
Genetic drift is an evolutionary mechanism that in a population it changes allelic frequencies over generations just by chance. For this reason, small populations are more susceptible to be affected by genetic drift than bigger populations.
In this example, Indiana Jones visited a small village of 50 people and over generations allele A probably was lost just by chance, or by genetic drift.
Answer:
Negative effects: Cutting down trees and littering have a negative effect on animals and plants.
Positive effects: Protecting endangered species and cleaning lakes and seas
Explanation:
Ecosystem science is the study of interrelationships among living organisms, biochemical processes, and human activities in ecological communities.
Two human activities which affect the ecosystem negatively:
1. Cutting down trees
2. littering harm animals and plants.
Two human activities which affect the ecosystem positively
1. Protecting endangered species
2. cleaning lakes and seas
